Learn CSS animation - Recreate Google’s gradient border effect!
Google's Gemini button effect looks tricky, but you can build the whole thing in pure CSS using custom properties and conic gradients.
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Most devs overcomplicate these glow animations with heavy JavaScript or an annoying stack of wrapper elements. I kept seeing that rotating gradient border on Google's Gemini buttons and assumed it was some canvas or SVG trick hiding under the hood. Nope. It's plain CSS with conic-gradient, pseudo-elements, and custom properties doing all the heavy lifting. The key trick here is using @property to tell the browser how to actually animate the angle, meaning you get a smooth spinning effect on a single button without extra HTML bloat. It's easily my favorite pattern to steal for glowing borders 🔥
Are you actually using @property in your CSS builds yet? Let me know in the comments below.
Live Demo: https://codepen.io/editor/optimisticw...
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Chapters
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00:00 Intro
00:55 Setting up the button
02:45 Using custom properties for the animation
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