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<!DOCTYPE html>
<html>
<body>

<h1>Hello World!</h1>

<button type="button" onclick="myFunction()">Set background color</button>

<script>
function myFunction() {
document.body.style.backgroundColor = "red";
}
</script>

</body>
</html>

<!DOCTYPE html>
<html>
<body>

<h1>Hello World!</h1>

<button type="button" onclick="myFunction()">Set background color</button>

<script>
function myFunction() {
    document.body.style.backgroundColor = "red";
}
</script>

</body>
</html>