CSS/background.html at main · Snowil-tuscano/CSS · 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>Change Background Color</title>
</head>
<body>
    <button onclick="changeBackgroundColor()">Change Background Color</button>
    <script>
        function changeBackgroundColor() {
            var col = prompt("Enter a color to change the background");
            if (col) { // Check if the user entered a color
                var newWindow = window.open("", "New Page", "width=400, height=400");
                newWindow.document.body.style.backgroundColor = col;
                document.body.style.backgroundColor = col;
                alert(" both  backgrounds are Changed ")
            }
        }
    </script>
</body>
</html>