Creating an inverted border-radius with CSS

The other day on Twitter, @FlorinPop pulled me into a conversation, wondering how to create inverted, round corners. Mask-image was probably the easy answer, but after someone in the thread said that making an SVG mask felt like overkill, I had to try and see if I could think of an alternative way! 🔗 Links ✅ The original tweet: https://twitter.com/florinpop1705/status/1647668618002329602 ✅ My finished code: https://codepen.io/kevinpowell/pen/LYgMQpQ ⌚ Timestamps 00:00 - Introduction 00:16 - The easiest solution? 00:30 - Setting up the layout 02:08 - The white separation 03:19 - Using a radial-gradient to make the corners 04:36 - Positioning the corner things 06:15 - Two problems with this solution #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!