Answer 1

First try self.

Answer 2

Then learn other things

Answer 3

with only HTML is not enough.

https://code.sololearn.com/Wz9simX5ARCA/?ref=app

Answer 4

Here is an example of how you can create a light/dark mode toggle switch using JavaScript:

// Get the checkbox element
let checkbox = document.querySelector('input[name=mode]');

// Function to toggle light and dark mode
function switchTheme(e) {
if (e.target.checked) {
document.documentElement.setAttribute('data-theme', 'dark');
}
else {
document.documentElement.setAttribute('data-theme', 'light');
}
}

// Event Listener on checkbox change
checkbox.addEventListener('change', switchTheme, false);

Answer 5

It is not possible with only HTML. HTML is for page structure. You must learn CSS to change the color. And JS to add the interactive element that will let you switch between colors.