<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>WebGL Centered Square</title> <style> body { margin: 0; overflow: hidden; } canvas { display: block; } </style> </head> <body> <canvas id="canvas"></canvas> <script src="main.js"></script> </body> </html>