diff --git a/Pipfile b/Pipfile
index 77dd016..11bf718 100644
--- a/Pipfile
+++ b/Pipfile
@@ -22,9 +22,11 @@ pytest = "*"
 python_version = "3.11"
 
 [scripts]
-web = "python /home/pi/led-controller/tests/web.py"
-watch = "python -m watchfiles 'python tests/web.py' src tests"
-install = "pipenv install"
+web = "python tests/web.py"
+watch = "python -m watchfiles \"python tests/web.py\" src tests"
 run = "sh -c 'cd src && python main.py'"
-dev = "watchfiles \"sh -c 'cd src && python main.py'\" src"
-help-pdf = "sh scripts/build_help_pdf.sh"
+dev = "python -m watchfiles \"sh -c 'cd src && python main.py'\" src"
+test = "python -m pytest"
+test-browser = "sh -c 'python tests/web.py > /tmp/led-controller-web.log 2>&1 & pid=$!; trap \"kill $pid\" EXIT; sleep 2; LED_CONTROLLER_RUN_BROWSER_TESTS=1 LED_CONTROLLER_DEVICE_IP=http://127.0.0.1:5000 python -m pytest tests/test_browser.py'"
+test-browser-device = "sh -c 'LED_CONTROLLER_RUN_BROWSER_TESTS=1 python -m pytest tests/test_browser.py'"
+
diff --git a/db/device.json b/db/device.json
index 5f87503..7068656 100644
--- a/db/device.json
+++ b/db/device.json
@@ -1 +1 @@
-{"188b0e1560a8": {"id": "188b0e1560a8", "name": "led-188b0e1560a8", "type": "led", "transport": "wifi", "address": "10.1.1.192", "default_pattern": null, "zones": []}, "dcb4d99988c8": {"id": "dcb4d99988c8", "name": "outside", "type": "led", "transport": "wifi", "address": "10.1.1.227", "default_pattern": null, "zones": []}}
\ No newline at end of file
+{"188b0e1560a8": {"id": "188b0e1560a8", "name": "led-188b0e1560a8", "type": "led", "transport": "wifi", "address": "10.1.1.193", "default_pattern": null, "zones": []}, "dcb4d99988c8": {"id": "dcb4d99988c8", "name": "outside", "type": "led", "transport": "wifi", "address": "10.1.1.227", "default_pattern": null, "zones": []}, "48f6ee2097c0": {"id": "48f6ee2097c0", "name": "roof", "type": "led", "transport": "wifi", "address": "10.1.1.196", "default_pattern": null, "zones": []}}
\ No newline at end of file
diff --git a/db/pattern.json b/db/pattern.json
index a437e8c..03f1f84 100644
--- a/db/pattern.json
+++ b/db/pattern.json
@@ -1 +1 @@
-{"on": {"min_delay": 10, "max_delay": 10000, "max_colors": 1}, "off": {"min_delay": 10, "max_delay": 10000, "max_colors": 0}, "rainbow": {"n1": "Step Rate", "min_delay": 10, "max_delay": 10000, "max_colors": 0}, "colour_cycle": {"n1": "Step Rate", "min_delay": 10, "max_delay": 10000, "max_colors": 10}, "transition": {"min_delay": 10, "max_delay": 10000, "max_colors": 10}, "chase": {"n1": "Colour 1 Length", "n2": "Colour 2 Length", "n3": "Step 1", "n4": "Step 2", "min_delay": 10, "max_delay": 10000, "max_colors": 2}, "pulse": {"n1": "Attack", "n2": "Hold", "n3": "Decay", "min_delay": 10, "max_delay": 10000, "max_colors": 10}, "circle": {"n1": "Head Rate", "n2": "Max Length", "n3": "Tail Rate", "n4": "Min Length", "min_delay": 10, "max_delay": 10000, "max_colors": 2}, "blink": {"min_delay": 10, "max_delay": 10000, "max_colors": 10}, "flicker": {"n1": "Min brightness", "min_delay": 10, "max_delay": 10000, "max_colors": 10}, "flame": {"n1": "Min brightness", "n2": "Breath period (ms)", "n3": "Spark gap min (ms, 0=default 10\u201330 s, -1=off)", "n4": "Spark gap max (ms)", "min_delay": 10, "max_delay": 10000, "max_colors": 10}, "twinkle": {"n1": "Twinkle activity (1\u2013255, higher = more changes)", "n2": "Density (0\u2013255, higher = more of the strip lit)", "n3": "Min adjacent LEDs per twinkle (same as max for fixed length)", "n4": "Max adjacent LEDs per twinkle (same as min for fixed length)", "min_delay": 10, "max_delay": 10000, "max_colors": 10}, "radiate": {"n1": "Node spacing (LEDs)", "n2": "Out time (ms)", "n3": "In time (ms)", "min_delay": 10, "max_delay": 10000, "max_colors": 2}, "meteor_rain": {"n1": "Tail length", "n2": "Speed (LEDs per frame)", "n3": "Fade amount (1-255)", "min_delay": 10, "max_delay": 10000, "max_colors": 10}, "scanner": {"n1": "Eye width", "n2": "End pause (frames)", "min_delay": 10, "max_delay": 10000, "max_colors": 10}, "gradient_scroll": {"n1": "Scroll step rate", "min_delay": 10, "max_delay": 10000, "max_colors": 10}, "comet_dual": {"n1": "Tail length", "n2": "Speed", "n3": "Gap", "max_colors": 10, "min_delay": 10, "max_delay": 10000}, "sparkle_trail": {"n1": "Spark density", "n2": "Decay", "max_colors": 10, "min_delay": 10, "max_delay": 10000}, "wave": {"n1": "Wavelength", "n2": "Amplitude", "n3": "Drift speed", "max_colors": 10, "min_delay": 10, "max_delay": 10000}, "plasma": {"n1": "Scale", "n2": "Speed", "n3": "Contrast", "max_colors": 10, "min_delay": 10, "max_delay": 10000}, "segment_chase": {"n1": "Segment size", "n2": "Phase step", "n3": "Segment phase offset", "n4": "Gap per segment", "max_colors": 10, "min_delay": 10, "max_delay": 10000}, "bar_graph": {"n1": "Level percent", "max_colors": 10, "min_delay": 10, "max_delay": 10000}, "breathing_dual": {"n1": "Phase offset", "n2": "Ease", "max_colors": 10, "min_delay": 10, "max_delay": 10000}, "strobe_burst": {"n1": "Burst count", "n2": "Burst gap", "n3": "Cooldown", "max_colors": 10, "min_delay": 10, "max_delay": 10000}, "rain_drops": {"n1": "Drop rate", "n2": "Ripple width", "max_colors": 10, "min_delay": 10, "max_delay": 10000}, "fireflies": {"n1": "Count", "n2": "Twinkle speed", "max_colors": 10, "min_delay": 10, "max_delay": 10000}, "clock_sweep": {"n1": "Hand width", "n2": "Marker interval", "max_colors": 10, "min_delay": 10, "max_delay": 10000}, "marquee": {"n1": "On length", "n2": "Off length", "n3": "Step", "max_colors": 10, "min_delay": 10, "max_delay": 10000}, "aurora": {"n1": "Band count", "n2": "Shimmer", "max_colors": 10, "min_delay": 10, "max_delay": 10000}, "snowfall": {"n1": "Flake density", "n2": "Fall speed", "max_colors": 10, "min_delay": 10, "max_delay": 10000}, "heartbeat": {"n1": "Pulse 1 ms", "n2": "Pulse 2 ms", "n3": "Pause ms", "max_colors": 10, "min_delay": 10, "max_delay": 10000}, "orbit": {"n1": "Orbit count", "n2": "Base speed", "max_colors": 10, "min_delay": 10, "max_delay": 10000}, "palette_morph": {"n1": "Morph ms", "n2": "Warp rate", "n3": "Turbulence", "max_colors": 10, "min_delay": 10, "max_delay": 10000}}
\ No newline at end of file
+{"on": {"min_delay": 10, "max_delay": 10000, "max_colors": 1}, "off": {"min_delay": 10, "max_delay": 10000, "max_colors": 0}, "rainbow": {"n1": "Step Rate", "min_delay": 10, "max_delay": 10000, "max_colors": 0}, "colour_cycle": {"n1": "Step Rate", "min_delay": 10, "max_delay": 10000, "max_colors": 10}, "transition": {"min_delay": 10, "max_delay": 10000, "max_colors": 10}, "chase": {"n1": "Colour 1 Length", "n2": "Colour 2 Length", "n3": "Step 1", "n4": "Step 2", "min_delay": 10, "max_delay": 10000, "max_colors": 2, "has_background": true}, "pulse": {"n1": "Attack", "n2": "Hold", "n3": "Decay", "min_delay": 10, "max_delay": 10000, "max_colors": 10, "has_background": true}, "circle": {"n1": "Head Rate", "n2": "Max Length", "n3": "Tail Rate", "n4": "Min Length", "min_delay": 10, "max_delay": 10000, "max_colors": 2, "has_background": true}, "blink": {"min_delay": 10, "max_delay": 10000, "max_colors": 10, "has_background": true}, "flicker": {"n1": "Min brightness", "min_delay": 10, "max_delay": 10000, "max_colors": 10}, "flame": {"n1": "Min brightness", "n2": "Breath period (ms)", "n3": "Spark gap min (ms, 0=default 10–30 s, -1=off)", "n4": "Spark gap max (ms)", "min_delay": 10, "max_delay": 10000, "max_colors": 10}, "twinkle": {"n1": "Twinkle activity (1–255, higher = more changes)", "n2": "Density (0–255, higher = more of the strip lit)", "n3": "Min adjacent LEDs per twinkle (same as max for fixed length)", "n4": "Max adjacent LEDs per twinkle (same as min for fixed length)", "min_delay": 10, "max_delay": 10000, "max_colors": 10, "has_background": true}, "radiate": {"n1": "Node spacing (LEDs)", "n2": "Out time (ms)", "n3": "In time (ms)", "min_delay": 10, "max_delay": 10000, "max_colors": 2, "has_background": true}, "meteor_rain": {"n1": "Tail length", "n2": "Speed (LEDs per frame)", "n3": "Fade amount (1-255)", "min_delay": 10, "max_delay": 10000, "max_colors": 10}, "scanner": {"n1": "Eye width", "n2": "End pause (frames)", "min_delay": 10, "max_delay": 10000, "max_colors": 10, "has_background": true}, "gradient_scroll": {"n1": "Scroll step rate", "min_delay": 10, "max_delay": 10000, "max_colors": 10}, "comet_dual": {"n1": "Tail length", "n2": "Speed", "n3": "Gap", "max_colors": 10, "min_delay": 10, "max_delay": 10000, "has_background": true}, "sparkle_trail": {"n1": "Spark density", "n2": "Decay", "max_colors": 10, "min_delay": 10, "max_delay": 10000}, "wave": {"n1": "Wavelength", "n2": "Amplitude", "n3": "Drift speed", "max_colors": 10, "min_delay": 10, "max_delay": 10000}, "plasma": {"n1": "Scale", "n2": "Speed", "n3": "Contrast", "max_colors": 10, "min_delay": 10, "max_delay": 10000}, "segment_chase": {"n1": "Segment size", "n2": "Phase step", "n3": "Segment phase offset", "n4": "Gap per segment", "max_colors": 10, "min_delay": 10, "max_delay": 10000, "has_background": true}, "bar_graph": {"n1": "Level percent", "max_colors": 10, "min_delay": 10, "max_delay": 10000, "has_background": true}, "breathing_dual": {"n1": "Phase offset", "n2": "Ease", "max_colors": 10, "min_delay": 10, "max_delay": 10000}, "strobe_burst": {"n1": "Burst count", "n2": "Burst gap", "n3": "Cooldown", "max_colors": 10, "min_delay": 10, "max_delay": 10000, "has_background": true}, "rain_drops": {"n1": "Drop rate", "n2": "Ripple width", "max_colors": 10, "min_delay": 10, "max_delay": 10000, "has_background": true}, "fireflies": {"n1": "Count", "n2": "Twinkle speed", "max_colors": 10, "min_delay": 10, "max_delay": 10000, "has_background": true}, "clock_sweep": {"n1": "Hand width", "n2": "Marker interval", "max_colors": 10, "min_delay": 10, "max_delay": 10000, "has_background": true}, "marquee": {"n1": "On length", "n2": "Off length", "n3": "Step", "max_colors": 10, "min_delay": 10, "max_delay": 10000, "has_background": true}, "aurora": {"n1": "Band count", "n2": "Shimmer", "max_colors": 10, "min_delay": 10, "max_delay": 10000}, "snowfall": {"n1": "Flake density", "n2": "Fall speed", "max_colors": 10, "min_delay": 10, "max_delay": 10000, "has_background": true}, "heartbeat": {"n1": "Pulse 1 ms", "n2": "Pulse 2 ms", "n3": "Pause ms", "max_colors": 10, "min_delay": 10, "max_delay": 10000, "has_background": true}, "orbit": {"n1": "Orbit count", "n2": "Base speed", "max_colors": 10, "min_delay": 10, "max_delay": 10000, "has_background": true}, "palette_morph": {"n1": "Morph ms", "n2": "Warp rate", "n3": "Turbulence", "max_colors": 10, "min_delay": 10, "max_delay": 10000}}
\ No newline at end of file
diff --git a/db/preset.json b/db/preset.json
index e42d91c..eb79284 100644
--- a/db/preset.json
+++ b/db/preset.json
@@ -1 +1 @@
-{"1": {"name": "on", "pattern": "on", "colors": ["#FFFFFF"], "brightness": 255, "delay": 100, "auto": true, "n1": 0, "n2": 0, "n3": 0, "n4": 0, "n5": 0, "n6": 0, "n7": 0, "n8": 0, "profile_id": "1"}, "2": {"name": "off", "pattern": "off", "colors": [], "brightness": 0, "delay": 100, "auto": true, "n1": 0, "n2": 0, "n3": 0, "n4": 0, "n5": 0, "n6": 0, "n7": 0, "n8": 0, "profile_id": "1"}, "3": {"name": "rainbow", "pattern": "rainbow", "colors": [], "brightness": 255, "delay": 100, "auto": true, "n1": 2, "n2": 0, "n3": 0, "n4": 0, "n5": 0, "n6": 0, "n7": 0, "n8": 0, "profile_id": "1"}, "4": {"name": "transition", "pattern": "transition", "colors": ["#FF0000", "#00FF00", "#0000FF", "#FFFFFF", "#0000FF", "#FFFF00"], "brightness": 255, "delay": 5000, "auto": true, "n1": 0, "n2": 0, "n3": 0, "n4": 0, "n5": 0, "n6": 0, "n7": 0, "n8": 0, "profile_id": "1", "palette_refs": [null, null, null, 6, 2, 3]}, "5": {"name": "chase", "pattern": "chase", "colors": ["#FF0000", "#0000FF"], "brightness": 255, "delay": 200, "auto": true, "n1": 5, "n2": 5, "n3": 1, "n4": 1, "n5": 0, "n6": 0, "n7": 0, "n8": 0, "profile_id": "1"}, "6": {"name": "pulse", "pattern": "pulse", "colors": ["#00FF00"], "brightness": 255, "delay": 500, "auto": true, "n1": 1000, "n2": 500, "n3": 1000, "n4": 0, "n5": 0, "n6": 0, "n7": 0, "n8": 0, "profile_id": "1"}, "7": {"name": "circle", "pattern": "circle", "colors": ["#FFA500", "#800080"], "brightness": 255, "delay": 200, "auto": true, "n1": 2, "n2": 10, "n3": 2, "n4": 5, "n5": 0, "n6": 0, "n7": 0, "n8": 0, "profile_id": "1"}, "8": {"name": "blink", "pattern": "blink", "colors": ["#FF0000", "#00FF00", "#0000FF", "#FFFF00"], "brightness": 255, "delay": 1000, "auto": true, "n1": 0, "n2": 0, "n3": 0, "n4": 0, "n5": 0, "n6": 0, "n7": 0, "n8": 0, "profile_id": "1"}, "9": {"name": "warm white", "pattern": "on", "colors": ["#FFF5E6"], "brightness": 200, "delay": 100, "auto": true, "n1": 0, "n2": 0, "n3": 0, "n4": 0, "n5": 0, "n6": 0, "n7": 0, "n8": 0, "profile_id": "1"}, "10": {"name": "cool white", "pattern": "on", "colors": ["#E6F2FF"], "brightness": 200, "delay": 100, "auto": true, "n1": 0, "n2": 0, "n3": 0, "n4": 0, "n5": 0, "n6": 0, "n7": 0, "n8": 0, "profile_id": "1"}, "11": {"name": "red", "pattern": "on", "colors": ["#FF0000"], "brightness": 255, "delay": 100, "auto": true, "n1": 0, "n2": 0, "n3": 0, "n4": 0, "n5": 0, "n6": 0, "n7": 0, "n8": 0, "profile_id": "1"}, "12": {"name": "blue", "pattern": "on", "colors": ["#0000FF"], "brightness": 255, "delay": 100, "auto": true, "n1": 0, "n2": 0, "n3": 0, "n4": 0, "n5": 0, "n6": 0, "n7": 0, "n8": 0, "profile_id": "1"}, "13": {"name": "rainbow slow", "pattern": "rainbow", "colors": [], "brightness": 255, "delay": 150, "auto": true, "n1": 1, "n2": 0, "n3": 0, "n4": 0, "n5": 0, "n6": 0, "n7": 0, "n8": 0, "profile_id": "1"}, "14": {"name": "pulse slow", "pattern": "pulse", "colors": ["#FF6600"], "brightness": 255, "delay": 800, "auto": true, "n1": 2000, "n2": 1000, "n3": 2000, "n4": 0, "n5": 0, 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"pattern": "colour_cycle", "colors": ["#FF0000", "#0000FF"], "brightness": 255, "delay": 100, "auto": true, "n1": 1, "n2": 0, "n3": 0, "n4": 0, "n5": 0, "n6": 0, "n7": 0, "n8": 0, "profile_id": "1", "palette_refs": [null, null]}, "39": {"name": "flicker", "pattern": "flicker", "colors": ["#ae00ff"], "brightness": 255, "delay": 50, "auto": true, "n1": 100, "n2": 0, "n3": 0, "n4": 0, "n5": 0, "n6": 0, "n7": 0, "n8": 0, "profile_id": "1", "palette_refs": [null]}, "40": {"name": "flame", "pattern": "flame", "colors": ["#ffc800"], "brightness": 128, "delay": 50, "auto": true, "n1": 35, "n2": 2600, "n3": 0, "n4": 0, "n5": 0, "n6": 0, "n7": 0, "n8": 0, "profile_id": "1", "palette_refs": [null]}, "41": {"name": "twinkle", "pattern": "twinkle", "colors": ["#78C8FF", "#508CFF", "#B478FF", "#64DCE8", "#A0C8FF"], "brightness": 255, "delay": 100, "auto": true, "n1": 150, "n2": 20, "n3": 0, "n4": 10, "n5": 0, "n6": 0, "n7": 0, "n8": 0, "profile_id": "1", "palette_refs": [null, null, null, null, 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\ No newline at end of file
diff --git a/db/zone.json b/db/zone.json
index 6fb2031..79669ee 100644
--- a/db/zone.json
+++ b/db/zone.json
@@ -1 +1 @@
-{"1": {"name": "default", "names": ["led-188b0e1560a8", "led-f0f5bdfb9d30"], "presets": [["4", "2", "7"], ["3", "14", "5"], ["8", "9", "1"], ["6", "38", "42"], ["39", "40", "41"], ["43", "44", "45"], ["46", "47", "48"], ["49", "50", "51"], ["52", "53", "54"], ["55", "56", "57"], ["58", "59", "60"], ["61", "62"]], "presets_flat": ["4", "2", "7", "3", "14", "5", "8", "9", "1", "6", "38", "42", "39", "40", "41", "43", "44", "45", "46", "47", "48", "49", "50", "51", "52", "53", "54", "55", "56", "57", "58", "59", "60", "61", "62"], "default_preset": "41", "brightness": 23}, "2": {"name": "default", "names": ["1", "2", "3", "4", "5", "6", "7", "8", "0", "a"], "presets": [["16", "17", "18"], ["19", "20", "21"], ["22", "23", "24"], ["25", "26", "27"], ["28", "29", "30"]], "presets_flat": ["16", "17", "18", "19", "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "30"]}, "3": {"name": "default", "names": ["1"], "presets": [], "default_preset": null}, "4": {"name": "default", "names": ["1"], "presets": [], "default_preset": null}, "5": {"name": "dj", "names": ["dj"], "presets": [["31", "32", "33"]], "default_preset": "31", "presets_flat": ["31", "32", "33"]}, "6": {"name": "default", "names": ["1"], "presets": [], "default_preset": null, "presets_flat": []}, "7": {"name": "dj", "names": ["dj"], "presets": [["34", "35", "36"]], "default_preset": "34", "presets_flat": ["34", "35", "36"]}, "8": {"name": "test", "names": ["led-188b0e1560a8"], "presets": [["1", "2", "3"], ["4", "5"]], "default_preset": "1", "presets_flat": ["1", "2", "3", "4", "5"], "brightness": 167}}
\ No newline at end of file
+{"1": {"name": "default", "names": ["led-188b0e1560a8", "led-f0f5bdfb9d30", "led-48f6ee2097c1"], "presets": [["2", "1", "9"], ["4", "3", "8"], ["45", "62", "7"], ["6", "38", "50"], ["5", "42", "39"], ["40", "41", "14"], ["43", "44", "46"], ["47", "48", "49"], ["59", "51", "52"], ["53", "54", "55"], ["56", "57", "58"], ["60", "61"]], "presets_flat": ["2", "1", "9", "4", "3", "8", "45", "62", "7", "6", "38", "50", "5", "42", "39", "40", "41", "14", "43", "44", "46", "47", "48", "49", "59", "51", "52", "53", "54", "55", "56", "57", "58", "60", "61"], "default_preset": "41", "brightness": 23}, "2": {"name": "default", "names": ["1", "2", "3", "4", "5", "6", "7", "8", "0", "a"], "presets": [["16", "17", "18"], ["19", "20", "21"], ["22", "23", "24"], ["25", "26", "27"], ["28", "29", "30"]], "presets_flat": ["16", "17", "18", "19", "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "30"]}, "3": {"name": "default", "names": ["1"], "presets": [], "default_preset": null}, "4": {"name": "default", "names": ["1"], "presets": [], "default_preset": null}, "5": {"name": "dj", "names": ["dj"], "presets": [["31", "32", "33"]], "default_preset": "31", "presets_flat": ["31", "32", "33"]}, "6": {"name": "default", "names": ["1"], "presets": [], "default_preset": null, "presets_flat": []}, "7": {"name": "dj", "names": ["dj"], "presets": [["34", "35", "36"]], "default_preset": "34", "presets_flat": ["34", "35", "36"]}, "8": {"name": "test", "names": ["led-188b0e1560a8"], "presets": [["1", "2", "3"], ["4", "5"]], "default_preset": "1", "presets_flat": ["1", "2", "3", "4", "5"], "brightness": 167}}
\ No newline at end of file
diff --git a/led-driver b/led-driver
index a79c6f4..fbebe9f 160000
--- a/led-driver
+++ b/led-driver
@@ -1 +1 @@
-Subproject commit a79c6f4dd3f1c6509139753e806b2869e3ba78c6
+Subproject commit fbebe9f4f919213cafc2d2a9c1d86185b6187c8a
diff --git a/src/controllers/pattern.py b/src/controllers/pattern.py
index 8d25199..0889a4c 100644
--- a/src/controllers/pattern.py
+++ b/src/controllers/pattern.py
@@ -367,6 +367,7 @@ async def create_driver_pattern(request):
     Body JSON:
       name, code (required),
       min_delay, max_delay, max_colors (optional numbers),
+      has_background (optional bool),
       n1..n8 (optional string labels),
       overwrite (optional, default true).
     """
@@ -409,6 +410,9 @@ async def create_driver_pattern(request):
                 "Content-Type": "application/json"
             }
 
+    if "has_background" in data:
+        meta["has_background"] = bool(data.get("has_background"))
+
     for i in range(1, 9):
         nk = "n%d" % i
         if nk not in data:
diff --git a/src/static/presets.js b/src/static/presets.js
index f412b75..1f7fe14 100644
--- a/src/static/presets.js
+++ b/src/static/presets.js
@@ -255,6 +255,18 @@ document.addEventListener('DOMContentLoaded', () => {
     return Number.isFinite(n) ? n : 0;
   };
 
+  const patternSupportsBackgroundColor = () => {
+    if (!presetPatternInput || !presetPatternInput.value) {
+      return false;
+    }
+    const pattern = String(presetPatternInput.value).trim();
+    const meta =
+      (cachedPatterns && cachedPatterns[pattern]) ||
+      (cachedPatterns && cachedPatterns[pattern.toLowerCase()]) ||
+      null;
+    return !!(meta && typeof meta === 'object' && meta.has_background === true);
+  };
+
   const renderPresetColors = (colors, paletteRefs) => {
     if (!presetColorsContainer) return;
     
@@ -296,14 +308,21 @@ document.addEventListener('DOMContentLoaded', () => {
     }
     
     const swatchContainer = document.createElement('div');
-    swatchContainer.style.cssText = 'display: flex; flex-wrap: wrap; gap: 0.5rem;';
+    swatchContainer.style.cssText = 'display: flex; flex-wrap: nowrap; gap: 0.5rem; align-items: flex-start; overflow-x: auto;';
     swatchContainer.classList.add('color-swatches-container');
     
+    const showBackgroundLabel = patternSupportsBackgroundColor() && currentPresetColors.length > 1;
     currentPresetColors.forEach((color, index) => {
+      const isBackgroundColor = showBackgroundLabel && index === currentPresetColors.length - 1;
       const swatchWrapper = document.createElement('div');
       swatchWrapper.style.cssText = 'position: relative; display: inline-block;';
+      if (isBackgroundColor) {
+        // Keep the background color swatch at the far right.
+        swatchWrapper.style.marginLeft = 'auto';
+      }
       swatchWrapper.draggable = true;
       swatchWrapper.dataset.colorIndex = index;
+      swatchWrapper.dataset.backgroundColor = isBackgroundColor ? '1' : '0';
       const refAtIndex = currentPresetPaletteRefs[index];
       swatchWrapper.dataset.paletteRef = Number.isInteger(refAtIndex) ? String(refAtIndex) : '';
       swatchWrapper.classList.add('draggable-color-swatch');
@@ -424,6 +443,18 @@ document.addEventListener('DOMContentLoaded', () => {
       swatchWrapper.appendChild(swatch);
       swatchWrapper.appendChild(colorPicker);
       swatchWrapper.appendChild(removeBtn);
+      if (isBackgroundColor) {
+        const bgLabel = document.createElement('div');
+        bgLabel.textContent = 'Background';
+        bgLabel.style.cssText = `
+          margin-top: 0.25rem;
+          text-align: center;
+          font-size: 0.72rem;
+          color: #cfcfcf;
+          letter-spacing: 0.02em;
+        `;
+        swatchWrapper.appendChild(bgLabel);
+      }
       swatchContainer.appendChild(swatchWrapper);
     });
     
@@ -445,6 +476,10 @@ document.addEventListener('DOMContentLoaded', () => {
       e.preventDefault();
       const dragging = swatchContainer.querySelector('.dragging-color');
       if (!dragging) return;
+      const backgroundEl = swatchContainer.querySelector('.draggable-color-swatch[data-background-color="1"]');
+      if (backgroundEl) {
+        swatchContainer.appendChild(backgroundEl);
+      }
       
       // Get new order of colors from DOM
       const colorElements = [...swatchContainer.querySelectorAll('.draggable-color-swatch')];
diff --git a/src/static/style.css b/src/static/style.css
index d6335d4..837d9af 100644
--- a/src/static/style.css
+++ b/src/static/style.css
@@ -550,14 +550,14 @@ body.preset-ui-run .edit-mode-only {
     padding: 0;
 }
 
-/* Zone preset selecting area: 3 columns, vertical scroll only */
+/* Zone preset selecting area: 8 columns on desktop, vertical scroll only */
 #presets-list-zone {
     flex: 1;
     min-height: 0;
     overflow-y: auto;
     overflow-x: hidden;
     display: grid;
-    grid-template-columns: repeat(3, minmax(0, 1fr));
+    grid-template-columns: repeat(8, minmax(0, 1fr));
     grid-auto-rows: 5rem;
     column-gap: 0.3rem;
     row-gap: 0.3rem;
@@ -1261,8 +1261,8 @@ body.preset-ui-run .edit-mode-only {
 .color-swatches-container {
     min-height: 80px;
 }
-/* Presets list: 3 columns and vertical scroll (defined above); mobile same */
-@media (max-width: 1000px) {
+/* Presets list: 3 columns on phone-sized screens */
+@media (max-width: 600px) {
     #presets-list-zone {
         grid-template-columns: repeat(3, minmax(0, 1fr));
         padding-bottom: calc(env(safe-area-inset-bottom, 0px) + 7rem);
diff --git a/tests/test_browser.py b/tests/test_browser.py
index f0c0a34..19f1b3c 100644
--- a/tests/test_browser.py
+++ b/tests/test_browser.py
@@ -2,7 +2,7 @@
 """
 Browser automation tests using Selenium.
 Tests run against the device in an actual browser. Target host defaults to
-``192.168.4.1``; override with ``LED_CONTROLLER_DEVICE_IP`` (IP or hostname,
+``127.0.0.1:5000``; override with ``LED_CONTROLLER_DEVICE_IP`` (IP or hostname,
 or a full ``http://`` / ``https://`` base URL).
 
 Fixed delays between UI steps use ``LED_CONTROLLER_BROWSER_SLEEP_SCALE``
@@ -49,7 +49,7 @@ from selenium.common.exceptions import (
     ElementNotInteractableException,
 )
 
-_DEFAULT_DEVICE_HOST = "192.168.4.1"
+_DEFAULT_DEVICE_HOST = "127.0.0.1:5000"
 
 
 def _device_base_url() -> str: