2026年4月のクールなCodePenデモ10選

shimmer accordion Jhey Tompkins creates beautiful components with perfect micro-interactions. This accordion is no exception with sliding, text appearing, color changes... A great experience as always. Vintage VHS blank tapes These VHS tapes CSS Art created by Gemma Croad perfectly evoque the style of the time, with all the colors, lines, and patterns. A taste of nostalgia served with a scoop of CSS gradients and shadows. Double animation marquee Normally I wouldn't highlight a marquee, but this one by Natalia is different. It has an ingenious way to use pseudo-elements and a scale transform to move the marquee in two directions (text to the left, colors to the right) while changing sizes. It was fun to explore the code. Pure CSS Ripple Effect Text effects on the web normally use JS or SVG, but Nik created this one using exclusively CSS. Combining radial gradients with blur and contrast filters (a technique that helps soften and smooth edges) and animations, makes for a nice ripple effect. Artemis 2 - scroll to launch #cssonly Chris Bolson created this CSS Art of the Artemis rocket and added a twist to it: as you scroll down the page, the rocket will launch and separate on its way to space. Note: because it uses scroll-driven animations, it does not work on Firefox yet. Puppet Strings - CSS Another CSS demo, this time by Josetxu. This time it is an interactive puppet that can be rotated or moved by using the strings on top. The author has been playing with 3D CSS lately, I can't wait to see what's coming next. GameBoy First was nostalgia with VHS, now it is nostalgia with video-games and consoles. A second CSS Art demo by Gemma Croad in this list, a GameBoy illustration coded only with HTML and CSS. Air Hockey Matt Cannon shared this air hockey game coded in JavaScript using an HTML5 canvas. The game is fun, the animations are smooth, and the difficulty is hard... really hard! I don't remember scoring a single goal! You should try it! Bauhaus countdown I love the Bauhaus style that Stijn Van Minnebruggen used to code this countdown numbers. They are slick, colorful, and smooth. The only thing that would make this demo even better would be doing the countdown in pure CSS instead of JavaScript, but I can see how that would be a pain in the neck. Looped Day / Night Blob Toggle Margarita combines SVG, CSS, and JavaScript to create an animated toggle that goes from day to night (and vice versa). I like how the JavaScript controls the animation so toggling preserves the state, continuing from the point it was triggered. shimmer accordion Jhey Tompkins creates beautiful components with perfect micro-interactions. This accordion is no exception with sliding, text appearing, color changes... A great experience as always. Vintage VHS blank tapes These VHS tapes CSS Art created by Gemma Croad perfectly evoque the style of the time, with all the colors, lines, and patterns. A taste of nostalgia served with a scoop of CSS gradients and shadows. Double animation marquee Normally I wouldn't highlight a marquee, but this one by Natalia is different. It has an ingenious way to use pseudo-elements and a scale transform to move the marquee in two directions (text to the left, colors to the right) while changing sizes. It was fun to explore the code. Pure CSS Ripple Effect Text effects on the web normally use JS or SVG, but Nik created this one using exclusively CSS. Combining radial gradients with blur and contrast filters (a technique that helps soften and smooth edges) and animations, makes for a nice ripple effect. Artemis 2 - scroll to launch #cssonly Chris Bolson created this CSS Art of the Artemis rocket and added a twist to it: as you scroll down the page, the rocket will launch and separate on its way to space. Note: because it uses scroll-driven animations, it does not work on Firefox yet. Puppet Strings - CSS Another CSS demo, this time by Josetxu. This time it is an interactive puppet that can be rotated or moved by using the strings on top. The author has been playing with 3D CSS lately, I can't wait to see what's coming next. GameBoy First was nostalgia with VHS, now it is nostalgia with video-games and consoles. A second CSS Art demo by Gemma Croad in this list, a GameBoy illustration coded only with HTML and CSS. Air Hockey Matt Cannon shared this air hockey game coded in JavaScript using an HTML5 canvas. The game is fun, the animations are smooth, and the difficulty is hard... really hard! I don't remember scoring a single goal! You should try it! Bauhaus countdown I love the Bauhaus style that Stijn Van Minnebruggen used to code this countdown numbers. They are slick, colorful, and smooth. The only thing that would make this demo even better would be doing the countdown in pure CSS instead of JavaScript, but I can see how that would be a pain in the neck. Looped Day / Night Blob Toggle Margarita combines SVG, CSS, and JavaScript to create an animated toggle that goes from day to night (and vice versa). I like how the JavaScript controls the animation so toggling preserves the state, continuing from the point it was triggered.