ShoelaceCSS is what could be called a “starter’s kit” for UI and web design. A highly customizable, pure CSS starter kit that weighs in at only 31KB minified (7.9KB gzipped). You can load it locally or via CDN, yet still customize everything with variables, and since they cascade, so you can override them as needed. To customize Shoelace, just override a few variables and you’re done. No preprocessing required!