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CSS Optical Illusions
Over the past week, I have coded a series of optical illusions using CSS only (and some HTML for one of them, but most of them are CSS only). I created a collection on CodePen with 40 of them, although the number may grow in the next few weeks. Many of them play with color effects, some others are a
Jan 15, 2026 0 5
0:09
Single-element toggle switch: Lock
A new toggle switch component added to the collection. This time I was browsing online and saw an ad (for a VPN or something) that had this image of a switch. It looked interesting, so I took a screenshot for later and then build it. You can find the code and live demo on CodePen: https://codepen.io
Oct 29, 2025 0 11
Timeline Component
My website has a "zig-zagging" timeline with my work history –which, by the way, needs to be updated... both that work history and the website in general. But that's a different story–, and a person shared some interest in it. The timeline is built with grid and it is so old, that to avoid issues wi
Sep 15, 2025 0 2
Template - Pyramid of Greatness
The other day, I shared the CSS Pyramid of Greatness, based on a Parks and Recreation's joke: the Swanson Pyramid of Greatness. Which is basically a triangle, but I guess that's part of the joke. I decided to transform the demo into a template, so it could easily be changed into a "Whatever Pyramid
Aug 8, 2025 0 1
The old way vs. The new way
I finally did it. I created a small library that lets me generate this type of cartoons faster, without repeating code (or not as much) and I used it to create next week's comic. It's about doing things the "old way" (lengthier, simpler, craftier) vs the "new way" (more complex, but faster after the
Aug 6, 2025 0 2
Hippopotenuse
I coded this using HTML and CSS, and some of the trigonometric functions –It uses hypot() to calculate the size of the hypotenuse, and atan() to calculate the rotation degree. TIL a couple of things while coding it: It is super easy to add Greek letters using HTML entities, it's just their name! (e.
Jul 19, 2025 0 1
Drawing with CSS: cartoon character
I did another piece of CSS Art, this time it is a monster or a cartoon character (depends on how you look at it.) Of this cartoon, I liked doing the head/face. It's kind of a squircle (combination of square and circle with rounded borders and edges) and a single HTML element. In the past I achieved
Jul 9, 2025 0
Centaur Slider
Yesterday, I wanted to create something and ended up with a weird centaur slider. Move the thumb and see how the creature changes. Considering I used an SVG for the human/centaur/horse, I should look into transforming the paths instead of using CSS to transition them. It will make the animations smo
Jun 26, 2025 0 1
10 Cool CodePen Demos from April 2025
Full article with images published on the site. Glitch Hover Effect Nazanin Ashrafi shared a series of creative button effects this month, all built with pure HTML and CSS. The animations are simple yet cleverly executed and well-achieved. This glitching button changing shapes and colors caught my a
May 9, 2025 0 1
Batman-Comic.CSS
Jun 17, 2024 0
1:01
Fun Project: Perspective
The other day I completed a fun side project adding perspective to one of my favorite paintings: The Wandered Above the Sea of Fog. It was a simple process with HTML and CSS (just adding layers with different images and Z-translations); what was more time-consuming was dividing the painting into lay
May 28, 2023 0 11
3D CSS Stapler [WIP]
Sep 5, 2022 0
Justify-content demo
As always, the whole thing is done with CSS and HTML. You can watch the process in this video: https://www.youtube.com/watch?v=KX8hr2QksXA And the source code and live demo: https://codepen.io/alvaromontoro/full/vYdyOxe
May 13, 2022 0 1
3D CSS Demo
Apr 25, 2022 0

