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Asked by Sagar Last Modified
Answer 
1. HTML: Create a <select> dropdown.
2. CSS: Define styles for three themes.
3. JS: Detect selection & apply the theme.
Code:
<select id="themeSelector">
<option value="light">Light</option>
<option value="dark">Dark</option>
<option value="blue">Blue</option>
</select>
<style>
body.light { background: white; color: black; }
body.dark { background: black; color: white; }
body.blue { background: #007bff; color: white; }
</style>
<script>
document.getElementById("themeSelector").addEventListener("change", function() {
document.body.className = th
is.value;
});
</script>
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