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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" content="width=device-width, height=device-height" />
<title>Color Grid</title>
</head>
<style>
body {
margin: 0;
}
.container {
display: grid;
grid-template-columns: 1fr 1fr 1fr;
}
.box {
height: 100vh;
width: 33.33vw;
}
.red {
background-color: rgb(255, 0, 0);
color-adjust: exact;
}
.green {
background-color: rgb(0, 255, 0);
color-adjust: exact;
}
.blue {
background-color: rgb(0, 0, 255);
color-adjust: exact;
}
</style>
<body>
<div class="container">
<div class="red box"></div>
<div class="green box"></div>
<div class="blue box"></div>
</div>
</body>
</html>