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<!DOCTYPE html>
<html><head>
<style>
#outer {
opacity: 0.8;
background-color:red;
width: 200px;
}
#inner {
opacity: 0.6;
background-color:black;
color:white;
}
</style>
</head>
<body>
<div id="outer">
<canvas width="200" height="200" style="display:block;" id="c1"></canvas>
<div id="inner">
<canvas width="200" height="400" style="display:block;" id="c2"></canvas>
</div>
</div>
<script>
var ctx = document.getElementById("c1").getContext("2d");
ctx.fillStyle = "black";
ctx.fillRect(0, 0, 200, 200);
var ctx = document.getElementById("c2").getContext("2d");
ctx.fillStyle = "black";
ctx.fillRect(0, 0, 200, 200);
ctx.fillStyle = "rgb(50,50,50)";
ctx.fillRect(0, 200, 200, 200);
</script>
</body></html>
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