<!DOCTYPE html>
<html>
<head>
<title>Canvas</title>
<script defer src="js/index.js"></script>
<style>
body {
text-align: center;
background-color: #333;
}
#canvas {
width: 500px;
height: 500px;
}
</style>
</head>
<body>
<canvas id="canvas"></canvas>
</body>
</html>