Coding-Freshers/theme.html at master · Jhil20/Coding-Freshers · GitHub

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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>Document</title>
    <style>
        .dark-mode{
            background-color: black;
            color: white;
        }
        body {
            background-color: aliceblue;
            margin: 0;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
        }
        .btn{
            border-radius: 9px;
            font-size: 50px;
            background-color: orange;
            border: none;
            width: 100%;
        }
        .btn:hover
        {
            background-color: gray;
        }
    </style>
</head>
<body>
    <div class="contain">

            <button class="btn" onclick="myFun()">Dark mode</button>

    </div>
    <script>
        function myFun(){
         let element =document.body;
         element.classList.toggle("dark-mode");
        }

    </script>
</body>
</html>