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43<html>
<script>
function changeBackground() {
const color = location.hash.substr(1);
document.body.style.backgroundColor = color;
}
</script>
<style>
body {
margin: 0;
}
.container {
display: grid;
background-color: rgb(0, 0, 0);
grid-template-columns: auto auto;
width: 100%;
height: 100%;
}
.cell {
border: none;
font-size: 30px;
text-align: center;
}
.cell.grey {
background-color: rgb(100, 100, 100);
}
.cell.red {
background-color: rgb(255, 0, 0);
}
</style>
<body>
<div class="container">
<div class="cell red"></div>
<div class="cell grey"></div>
<div class="cell grey"></div>
<div class="cell red"></div>
</div>
</body>
</html>