How is this possible with CSS only?!

I’ve done reaction videos in the past where I looked at crazy codepens, and today, we’re starting a new series where I find one such codepen and see if I can understand how it was created, with a dive into the :has() pseudo-class, which is now supported in Chrome and Safari. 🔗 Links ✅ Jhey's code: https://codepen.io/jh3y/pen/yLKMOBm ✅ My starting code: https://codepen.io/kevinpowell/pen/MWVQQae ✅ :has() browser support: https://caniuse.com/?search=has ⌚ Timestamps 00:00 - Introduction 00:51 - what I'm trying to copy 04:20 - Setting up my custom properties 05:01 - Using :has() 06:18 - setting up the different states 10:54 - Adding the shaking animation 12:51 - removing the animation when the input is empty 16:54 - changing the style of the button when everything is valid 19:55 - should I do more videos like this one? #css -- Come hang out with other dev's in my Discord Community 💬 https://discord.gg/nTYCvrK Keep up to date with everything I'm up to ✉ https://www.kevinpowell.co/newsletter Come hang out with me live every Monday on Twitch! 📺 https://www.twitch.tv/kevinpowellcss --- Help support my channel 👨‍🎓 Get a course: https://www.kevinpowell.co/courses 👕 Buy a shirt: https://teespring.com/stores/making-the-internet-awesome 💖 Support me on Patreon: https://www.patreon.com/kevinpowell --- My editor: VS Code - https://code.visualstudio.com/ --- 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, make sure to follow me on Instagram and Twitter. Twitter: https://twitter.com/KevinJPowell 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!