Make this fun effect that follows your cursor (pure CSS)

Video Description

✅ Final code: https://codepen.io/kevinpowell/pen/vENZzBd ✅ More info on corner shape: https://frontendmasters.com/blog/understanding-css-corner-shape-and-the-power-of-the-superellipse/ ✅ Odd Bird’s article on fixing issues with anchor positioning: https://www.oddbird.net/2025/01/29/anchor-position-validity/ ✅ Easing Wizard: https://easingwizard.com/ ✅ Anchor position polyfill: https://github.com/oddbird/css-anchor-positioning ✅ I’ve got courses! https://kevinpowell.co/courses ✉ Keep up to date with everything I'm up to https://www.kevinpowell.co/newsletter 💬 Come hang out with other devs in my Discord Community https://discord.gg/nTYCvrK ⭐ Are you a beginner? HTML & CSS for absolute beginners is for you: https://learn.kevinpowell.co 🎓 Start writing CSS with confidence with CSS Demystified: [https://cssdemystified.com](https://cssdemystified.com/) 🚀 Already mastered CSS? Check out my advanced course, Beyond CSS: https://www.beyondcss.dev/ ⌚ Timestamps 00:00 - Introduction 00:37 - Basic setup 02:18 - Adding the pseudo-element for the “bubble” 03:30 - My first failed attempt at using anchor positioning 08:12 - How you can animate the anchor position between elements 10:20 - Be careful with position relative and anchor positioning 13:40 - Using calc() with anchor() 16:50 - Fixing the stacking of elements 17:45 - Improving the animation and shapes 20:16 - The cutout effect #css --- Help support my channel 👨‍🎓 Get a course: https://www.kevinpowell.co/courses 👕 Buy a shirt: https://cottonbureau.com/people/kevin-powell 💖 Support me on Patreon: https://www.patreon.com/kevinpowell or through YT memberships: https://youtube.com/@KevinPowell/join --- 🧑‍💻 My editor: VS Code - https://code.visualstudio.com/ 🌈 My theme: One Dark Pro Var Night 🔤 My font: Cascadia Code --- I'm on some other places on the internet too! If you'd like a behind the scenes and previews of what's coming up on my YouTube channel: Bluesky: https://bsky.app/profile/kevinpowell.co Codepen: https://codepen.io/kevinpowell/ Github: https://github.com/kevin-powell --- And whatever you do, don't forget to keep on making your corner of the internet just a little bit more awesome!