CSS

Updating CSS Variables with Javascript

If you are building an application or SaaS platform, or in fact any website, it can be useful to store all your colours as CSS variables, and then update these once to change the theme of the app.

Fortunately this is relatively straightforward to accomplish. Imagine you have your CSS variables set up like this:

    :root {
        --main-background: blue;
        --main-sidebar: red;
        /* Yes these colors do not match */
    }

:root CSS styles are stored on document.documentElement. So we can access all of its styles via that. So in JS, all we need to do is this:

    document.documentElement.style.setProperty("--main-background", "yellow");

More Tips and Tricks for CSS

• Parent Selection in CSS: how the CSS has selector works
• CSS Pixel Art Generator
• Centering Elements in CSS with Tailwind
• CSS Animations
• What are Variable Fonts in CSS, and How to Use Them
• Stripe-Like Smooth Transition CSS Only Menu
• Multi colored text in CSS
• The Interactive Guide to CSS Grid
• CSS Media Queries
• CSS Colors