From f4d188ec998a7afd6b39b04da6ad72d330c20522 Mon Sep 17 00:00:00 2001
From: quilicicf <quilicicf@gmail.com>
Date: Tue, 29 Oct 2019 13:23:59 +0100
Subject: [PATCH 1/2] Expose theme variables in CSS custom properties

---
 css/theme/beige.css             | 25 +++++++++++++++++++++++++
 css/theme/black.css             | 25 +++++++++++++++++++++++++
 css/theme/blood.css             | 25 +++++++++++++++++++++++++
 css/theme/league.css            | 25 +++++++++++++++++++++++++
 css/theme/moon.css              | 25 +++++++++++++++++++++++++
 css/theme/night.css             | 25 +++++++++++++++++++++++++
 css/theme/serif.css             | 25 +++++++++++++++++++++++++
 css/theme/simple.css            | 25 +++++++++++++++++++++++++
 css/theme/sky.css               | 25 +++++++++++++++++++++++++
 css/theme/solarized.css         | 25 +++++++++++++++++++++++++
 css/theme/template/exposer.scss | 27 +++++++++++++++++++++++++++
 css/theme/template/theme.scss   |  2 ++
 css/theme/white.css             | 25 +++++++++++++++++++++++++
 13 files changed, 304 insertions(+)
 create mode 100644 css/theme/template/exposer.scss

diff --git a/css/theme/beige.css b/css/theme/beige.css
index 615dd6d..f608f8d 100644
--- a/css/theme/beige.css
+++ b/css/theme/beige.css
@@ -8,6 +8,31 @@
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
+:root {
+  --background-color: #f7f3de;
+  --main-font: Lato, sans-serif;
+  --main-font-size: 40px;
+  --main-color: #333;
+  --block-margin: 20px;
+  --heading-margin: 0 0 20px 0;
+  --heading-font: League Gothic, Impact, sans-serif;
+  --heading-color: #333;
+  --heading-line-height: 1.2;
+  --heading-letter-spacing: normal;
+  --heading-text-transform: uppercase;
+  --heading-text-shadow: none;
+  --heading-font-weight: normal;
+  --heading1-text-shadow: 0 1px 0 #ccc, 0 2px 0 #c9c9c9, 0 3px 0 #bbb, 0 4px 0 #b9b9b9, 0 5px 0 #aaa, 0 6px 1px rgba(0, 0, 0, 0.1), 0 0 5px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.3), 0 3px 5px rgba(0, 0, 0, 0.2), 0 5px 10px rgba(0, 0, 0, 0.25), 0 20px 20px rgba(0, 0, 0, 0.15);
+  --heading1-size: 3.77em;
+  --heading2-size: 2.11em;
+  --heading3-size: 1.55em;
+  --heading4-size: 1em;
+  --code-font: monospace;
+  --link-color: #8b743d;
+  --link-color-hover: #c0a86e;
+  --selection-background-color: rgba(79, 64, 28, 0.99);
+  --selection-color: #fff; }
+
 body {
   background: #f7f2d3;
   background: -moz-radial-gradient(center, circle cover, white 0%, #f7f2d3 100%);
diff --git a/css/theme/black.css b/css/theme/black.css
index 7dd88c2..67b21c9 100644
--- a/css/theme/black.css
+++ b/css/theme/black.css
@@ -10,6 +10,31 @@ section.has-light-background, section.has-light-background h1, section.has-light
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
+:root {
+  --background-color: #191919;
+  --main-font: Source Sans Pro, Helvetica, sans-serif;
+  --main-font-size: 42px;
+  --main-color: #fff;
+  --block-margin: 20px;
+  --heading-margin: 0 0 20px 0;
+  --heading-font: Source Sans Pro, Helvetica, sans-serif;
+  --heading-color: #fff;
+  --heading-line-height: 1.2;
+  --heading-letter-spacing: normal;
+  --heading-text-transform: uppercase;
+  --heading-text-shadow: none;
+  --heading-font-weight: 600;
+  --heading1-text-shadow: none;
+  --heading1-size: 2.5em;
+  --heading2-size: 1.6em;
+  --heading3-size: 1.3em;
+  --heading4-size: 1em;
+  --code-font: monospace;
+  --link-color: #42affa;
+  --link-color-hover: #8dcffc;
+  --selection-background-color: #bee4fd;
+  --selection-color: #fff; }
+
 body {
   background: #191919;
   background-color: #191919; }
diff --git a/css/theme/blood.css b/css/theme/blood.css
index 5cbd488..342982c 100644
--- a/css/theme/blood.css
+++ b/css/theme/blood.css
@@ -13,6 +13,31 @@
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
+:root {
+  --background-color: #222;
+  --main-font: Ubuntu, sans-serif;
+  --main-font-size: 40px;
+  --main-color: #eee;
+  --block-margin: 20px;
+  --heading-margin: 0 0 20px 0;
+  --heading-font: Ubuntu, sans-serif;
+  --heading-color: #eee;
+  --heading-line-height: 1.2;
+  --heading-letter-spacing: normal;
+  --heading-text-transform: uppercase;
+  --heading-text-shadow: 2px 2px 2px #222;
+  --heading-font-weight: normal;
+  --heading1-text-shadow: 0 1px 0 #ccc, 0 2px 0 #c9c9c9, 0 3px 0 #bbb, 0 4px 0 #b9b9b9, 0 5px 0 #aaa, 0 6px 1px rgba(0, 0, 0, 0.1), 0 0 5px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.3), 0 3px 5px rgba(0, 0, 0, 0.2), 0 5px 10px rgba(0, 0, 0, 0.25), 0 20px 20px rgba(0, 0, 0, 0.15);
+  --heading1-size: 3.77em;
+  --heading2-size: 2.11em;
+  --heading3-size: 1.55em;
+  --heading4-size: 1em;
+  --code-font: monospace;
+  --link-color: #a23;
+  --link-color-hover: #dd5566;
+  --selection-background-color: #a23;
+  --selection-color: #fff; }
+
 body {
   background: #222;
   background-color: #222; }
diff --git a/css/theme/league.css b/css/theme/league.css
index f8fba4d..a419955 100644
--- a/css/theme/league.css
+++ b/css/theme/league.css
@@ -10,6 +10,31 @@
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
+:root {
+  --background-color: #2b2b2b;
+  --main-font: Lato, sans-serif;
+  --main-font-size: 40px;
+  --main-color: #eee;
+  --block-margin: 20px;
+  --heading-margin: 0 0 20px 0;
+  --heading-font: League Gothic, Impact, sans-serif;
+  --heading-color: #eee;
+  --heading-line-height: 1.2;
+  --heading-letter-spacing: normal;
+  --heading-text-transform: uppercase;
+  --heading-text-shadow: 0px 0px 6px rgba(0, 0, 0, 0.2);
+  --heading-font-weight: normal;
+  --heading1-text-shadow: 0 1px 0 #ccc, 0 2px 0 #c9c9c9, 0 3px 0 #bbb, 0 4px 0 #b9b9b9, 0 5px 0 #aaa, 0 6px 1px rgba(0, 0, 0, 0.1), 0 0 5px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.3), 0 3px 5px rgba(0, 0, 0, 0.2), 0 5px 10px rgba(0, 0, 0, 0.25), 0 20px 20px rgba(0, 0, 0, 0.15);
+  --heading1-size: 3.77em;
+  --heading2-size: 2.11em;
+  --heading3-size: 1.55em;
+  --heading4-size: 1em;
+  --code-font: monospace;
+  --link-color: #13DAEC;
+  --link-color-hover: #71e9f4;
+  --selection-background-color: #FF5E99;
+  --selection-color: #fff; }
+
 body {
   background: #1c1e20;
   background: -moz-radial-gradient(center, circle cover, #555a5f 0%, #1c1e20 100%);
diff --git a/css/theme/moon.css b/css/theme/moon.css
index d18f526..a84cd73 100644
--- a/css/theme/moon.css
+++ b/css/theme/moon.css
@@ -14,6 +14,31 @@ html * {
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
+:root {
+  --background-color: #002b36;
+  --main-font: Lato, sans-serif;
+  --main-font-size: 40px;
+  --main-color: #93a1a1;
+  --block-margin: 20px;
+  --heading-margin: 0 0 20px 0;
+  --heading-font: League Gothic, Impact, sans-serif;
+  --heading-color: #eee8d5;
+  --heading-line-height: 1.2;
+  --heading-letter-spacing: normal;
+  --heading-text-transform: uppercase;
+  --heading-text-shadow: none;
+  --heading-font-weight: normal;
+  --heading1-text-shadow: none;
+  --heading1-size: 3.77em;
+  --heading2-size: 2.11em;
+  --heading3-size: 1.55em;
+  --heading4-size: 1em;
+  --code-font: monospace;
+  --link-color: #268bd2;
+  --link-color-hover: #78b9e6;
+  --selection-background-color: #d33682;
+  --selection-color: #fff; }
+
 body {
   background: #002b36;
   background-color: #002b36; }
diff --git a/css/theme/night.css b/css/theme/night.css
index f5ccb52..31a8db2 100644
--- a/css/theme/night.css
+++ b/css/theme/night.css
@@ -8,6 +8,31 @@
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
+:root {
+  --background-color: #111;
+  --main-font: Open Sans, sans-serif;
+  --main-font-size: 40px;
+  --main-color: #eee;
+  --block-margin: 20px;
+  --heading-margin: 0 0 20px 0;
+  --heading-font: Montserrat, Impact, sans-serif;
+  --heading-color: #eee;
+  --heading-line-height: 1.2;
+  --heading-letter-spacing: -0.03em;
+  --heading-text-transform: none;
+  --heading-text-shadow: none;
+  --heading-font-weight: normal;
+  --heading1-text-shadow: none;
+  --heading1-size: 3.77em;
+  --heading2-size: 2.11em;
+  --heading3-size: 1.55em;
+  --heading4-size: 1em;
+  --code-font: monospace;
+  --link-color: #e7ad52;
+  --link-color-hover: #f3d7ac;
+  --selection-background-color: #e7ad52;
+  --selection-color: #fff; }
+
 body {
   background: #111;
   background-color: #111; }
diff --git a/css/theme/serif.css b/css/theme/serif.css
index 6514a6f..c277596 100644
--- a/css/theme/serif.css
+++ b/css/theme/serif.css
@@ -10,6 +10,31 @@
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
+:root {
+  --background-color: #F0F1EB;
+  --main-font: Palatino Linotype, Book Antiqua, Palatino, FreeSerif, serif;
+  --main-font-size: 40px;
+  --main-color: #000;
+  --block-margin: 20px;
+  --heading-margin: 0 0 20px 0;
+  --heading-font: Palatino Linotype, Book Antiqua, Palatino, FreeSerif, serif;
+  --heading-color: #383D3D;
+  --heading-line-height: 1.2;
+  --heading-letter-spacing: normal;
+  --heading-text-transform: none;
+  --heading-text-shadow: none;
+  --heading-font-weight: normal;
+  --heading1-text-shadow: none;
+  --heading1-size: 3.77em;
+  --heading2-size: 2.11em;
+  --heading3-size: 1.55em;
+  --heading4-size: 1em;
+  --code-font: monospace;
+  --link-color: #51483D;
+  --link-color-hover: #8b7c69;
+  --selection-background-color: #26351C;
+  --selection-color: #fff; }
+
 body {
   background: #F0F1EB;
   background-color: #F0F1EB; }
diff --git a/css/theme/simple.css b/css/theme/simple.css
index a7a29a6..e34f521 100644
--- a/css/theme/simple.css
+++ b/css/theme/simple.css
@@ -13,6 +13,31 @@ section.has-dark-background, section.has-dark-background h1, section.has-dark-ba
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
+:root {
+  --background-color: #fff;
+  --main-font: Lato, sans-serif;
+  --main-font-size: 40px;
+  --main-color: #000;
+  --block-margin: 20px;
+  --heading-margin: 0 0 20px 0;
+  --heading-font: News Cycle, Impact, sans-serif;
+  --heading-color: #000;
+  --heading-line-height: 1.2;
+  --heading-letter-spacing: normal;
+  --heading-text-transform: none;
+  --heading-text-shadow: none;
+  --heading-font-weight: normal;
+  --heading1-text-shadow: none;
+  --heading1-size: 3.77em;
+  --heading2-size: 2.11em;
+  --heading3-size: 1.55em;
+  --heading4-size: 1em;
+  --code-font: monospace;
+  --link-color: #00008B;
+  --link-color-hover: #0000f1;
+  --selection-background-color: rgba(0, 0, 0, 0.99);
+  --selection-color: #fff; }
+
 body {
   background: #fff;
   background-color: #fff; }
diff --git a/css/theme/sky.css b/css/theme/sky.css
index d8734c9..744783d 100644
--- a/css/theme/sky.css
+++ b/css/theme/sky.css
@@ -11,6 +11,31 @@
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
+:root {
+  --background-color: #f7fbfc;
+  --main-font: Open Sans, sans-serif;
+  --main-font-size: 40px;
+  --main-color: #333;
+  --block-margin: 20px;
+  --heading-margin: 0 0 20px 0;
+  --heading-font: Quicksand, sans-serif;
+  --heading-color: #333;
+  --heading-line-height: 1.2;
+  --heading-letter-spacing: -0.08em;
+  --heading-text-transform: uppercase;
+  --heading-text-shadow: none;
+  --heading-font-weight: normal;
+  --heading1-text-shadow: none;
+  --heading1-size: 3.77em;
+  --heading2-size: 2.11em;
+  --heading3-size: 1.55em;
+  --heading4-size: 1em;
+  --code-font: monospace;
+  --link-color: #3b759e;
+  --link-color-hover: #74a7cb;
+  --selection-background-color: #134674;
+  --selection-color: #fff; }
+
 body {
   background: #add9e4;
   background: -moz-radial-gradient(center, circle cover, #f7fbfc 0%, #add9e4 100%);
diff --git a/css/theme/solarized.css b/css/theme/solarized.css
index f1a2b9e..430ccee 100644
--- a/css/theme/solarized.css
+++ b/css/theme/solarized.css
@@ -14,6 +14,31 @@ html * {
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
+:root {
+  --background-color: #fdf6e3;
+  --main-font: Lato, sans-serif;
+  --main-font-size: 40px;
+  --main-color: #657b83;
+  --block-margin: 20px;
+  --heading-margin: 0 0 20px 0;
+  --heading-font: League Gothic, Impact, sans-serif;
+  --heading-color: #586e75;
+  --heading-line-height: 1.2;
+  --heading-letter-spacing: normal;
+  --heading-text-transform: uppercase;
+  --heading-text-shadow: none;
+  --heading-font-weight: normal;
+  --heading1-text-shadow: none;
+  --heading1-size: 3.77em;
+  --heading2-size: 2.11em;
+  --heading3-size: 1.55em;
+  --heading4-size: 1em;
+  --code-font: monospace;
+  --link-color: #268bd2;
+  --link-color-hover: #78b9e6;
+  --selection-background-color: #d33682;
+  --selection-color: #fff; }
+
 body {
   background: #fdf6e3;
   background-color: #fdf6e3; }
diff --git a/css/theme/template/exposer.scss b/css/theme/template/exposer.scss
new file mode 100644
index 0000000..77a9ad1
--- /dev/null
+++ b/css/theme/template/exposer.scss
@@ -0,0 +1,27 @@
+// Exposes theme's variables for easy re-use in CSS for plugin authors
+
+:root {
+  --background-color: #{$backgroundColor};
+  --main-font: #{$mainFont};
+  --main-font-size: #{$mainFontSize};
+  --main-color: #{$mainColor};
+  --block-margin: #{$blockMargin};
+  --heading-margin: #{$headingMargin};
+  --heading-font: #{$headingFont};
+  --heading-color: #{$headingColor};
+  --heading-line-height: #{$headingLineHeight};
+  --heading-letter-spacing: #{$headingLetterSpacing};
+  --heading-text-transform: #{$headingTextTransform};
+  --heading-text-shadow: #{$headingTextShadow};
+  --heading-font-weight: #{$headingFontWeight};
+  --heading1-text-shadow: #{$heading1TextShadow};
+  --heading1-size: #{$heading1Size};
+  --heading2-size: #{$heading2Size};
+  --heading3-size: #{$heading3Size};
+  --heading4-size: #{$heading4Size};
+  --code-font: #{$codeFont};
+  --link-color: #{$linkColor};
+  --link-color-hover: #{$linkColorHover};
+  --selection-background-color: #{$selectionBackgroundColor};
+  --selection-color: #{$selectionColor};
+}
diff --git a/css/theme/template/theme.scss b/css/theme/template/theme.scss
index 9ccfaf5..c5859c6 100644
--- a/css/theme/template/theme.scss
+++ b/css/theme/template/theme.scss
@@ -4,6 +4,8 @@
  * GLOBAL STYLES
  *********************************************/
 
+@import "./exposer";
+
 body {
 	@include bodyBackground();
 	background-color: $backgroundColor;
diff --git a/css/theme/white.css b/css/theme/white.css
index 43ef2c7..97483be 100644
--- a/css/theme/white.css
+++ b/css/theme/white.css
@@ -10,6 +10,31 @@ section.has-dark-background, section.has-dark-background h1, section.has-dark-ba
 /*********************************************
  * GLOBAL STYLES
  *********************************************/
+:root {
+  --background-color: #fff;
+  --main-font: Source Sans Pro, Helvetica, sans-serif;
+  --main-font-size: 42px;
+  --main-color: #222;
+  --block-margin: 20px;
+  --heading-margin: 0 0 20px 0;
+  --heading-font: Source Sans Pro, Helvetica, sans-serif;
+  --heading-color: #222;
+  --heading-line-height: 1.2;
+  --heading-letter-spacing: normal;
+  --heading-text-transform: uppercase;
+  --heading-text-shadow: none;
+  --heading-font-weight: 600;
+  --heading1-text-shadow: none;
+  --heading1-size: 2.5em;
+  --heading2-size: 1.6em;
+  --heading3-size: 1.3em;
+  --heading4-size: 1em;
+  --code-font: monospace;
+  --link-color: #2a76dd;
+  --link-color-hover: #6ca0e8;
+  --selection-background-color: #98bdef;
+  --selection-color: #fff; }
+
 body {
   background: #fff;
   background-color: #fff; }

From e40fb3275d4a91ef79c4121372d78a61f0b55259 Mon Sep 17 00:00:00 2001
From: quilicicf <quilicicf@gmail.com>
Date: Thu, 31 Oct 2019 15:18:59 +0100
Subject: [PATCH 2/2] Document theme variable exposition in README theming
 section

---
 README.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/README.md b/README.md
index 3be68fb..a6dfbb4 100644
--- a/README.md
+++ b/README.md
@@ -1201,6 +1201,7 @@ Each theme is available as a separate stylesheet. To change theme you will need
 
 If you want to add a theme of your own see the instructions here: [/css/theme/README.md](https://github.com/hakimel/reveal.js/blob/master/css/theme/README.md).
 
+All theme variables are exposed as CSS custom properties in the pseudo-class `:root`. See [the list of exposed variables](https://github.com/hakimel/reveal.js/blob/master/css/theme/template/exposer.scss).
 
 ## Speaker Notes