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

• How to make a div the same height as the browser window
• Putting Javascript in Your CSS with Paint Worklets
• Creating Custom, Interactive CSS Checkboxes
• Using Only CSS to Recreate Windows 98
• Making a CSS Only Minecraft Chicken
• CSS Text
• CSS Pixel Art Generator
• CSS Glass Morphism Generator
• An Interactive Guide to CSS Flex Box
• How to Animate SVG paths with CSS