html/java.html at main · Rsc2414/html · 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>
        button
        {
            height: 50px;
            width: 200px;
            border-radius: 10px;
        }
    </style>
</head>
<body>

    <div id="div" style="height: 100vh;width:100vw">
        <center><button onclick="f1()" on  id="but">dark mode</button></center>


    </div>
    <script>
        var a=document.getElementById('div')
        a.style.backgroundColor='white'
        var t=true;
        function f1()
        {

            if(t)
            {
                a.style.backgroundColor='black'
                var b = document.getElementById('but')
                b.innerHTML='white mode'
            }
            else
            {
                a.style.backgroundColor='white'
                var b = document.getElementById('but')
                b.innerHTML='Dark mode'
            }
            t=!t

        }

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