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button for dark mode :

   
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try button....


   <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Change Styles</title>
    <style>
        body {
            transition: background-color 0.5s, color 0.5s;
        }

        .special-css {
            position: absolute;
            cursor: pointer;
            transition: background-color 0.5s, border-radius 0.5s;
            padding: 10px;
            width: 2px;
            height: 2px;
            background-color:yellow;
            border-radius: 19px;
            margin-left: 5px;
            margin-top: 4px;
            transition: 1s;
        }

        .bar {
            width: 77px;
            height: 30px;
            border-radius: 20px;
           background-color: #8DD2FF;
            transition: background-color 1s;
            border: 2px solid #8DD2FF;

        }

        .dark-mode {
            background-color: #FFF775;
            color: white;
            animation: go 1s;
            margin-left: 50px;
            transition: 1s;
        }

        .box {
           background-color: #545454;
           transition: 1s;
           border: 2px solid #545454;
        }
    </style>
</head>
<body>
    <div class="bar"><div id="changeStylesButton" class="special-css"></div></div>

    <script>
        var isDarkMode = false;

        document.getElementById('changeStylesButton').addEventListener('click', function() {
            var button = this;
            var bar = document.querySelector('.bar');

            if (isDarkMode) {
                // Change to light mode
                document.body.style.backgroundColor = 'white';
                document.body.style.color = 'black';
                button.classList.remove('dark-mode');
                bar.classList.remove('box');
            } else {
                // Change to dark mode
                document.body.style.backgroundColor = 'black';
                document.body.style.color = 'white';
                button.classList.add('dark-mode');
                bar.classList.add('box');
            }
            
            // Toggle the state
            isDarkMode = !isDarkMode;
        });
    </script>
<h1>Hello World</h1>
<h3>welcome to our site..</h3>
</body>
</html>