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first.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>First</title>
<link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">
</head>
<body>
<h1 id="header">First Code</h1>
<button type="button" name="Black" onclick="pageColor1()" class="btn btn-sm btn-primary">black</button>
<button type="button" name="Black" onclick="pageColor2()" class="btn btn-primary btn-sm">white</button>
<script>
function pageColor1(){
document.getElementById("header").style.color="white";
document.body.style.backgroundColor="black";
}
function pageColor2(){
document.getElementById("header").style.color="black";
document.body.style.backgroundColor="white";
}
</script>
</body>
</html>