Establishing a new block formatting context using overflow: hidden;

Today Vasilis tweeted a link to a very nice (and old, apparently) CSS trick: Here's your monthly reminder that this is an obscure, but very handy feature of CSS overflow. — Vasilis (@vasilis) February 13, 2014 Overflow does some cool things you should know about. Creates Block Formatting Context Clears Floats The second feature […]

Vertical align anything with just 3 lines of CSS

.element { position: relative; top: 50%; transform: translateY(-50%); } Same goes for horizontal centering. Where one – back in the day – would abuse margin-left by setting a negative margin to half of the width, we can now use translateX(-50%) to horizontally center a fluid-width box. .element { position: relative; width: 400px; left: 50%; margin-left: […]

CSS Animated Content Switching

A trend I’m seeing for the coming year is the rise of Transitional Interfaces on the web. A fine example is the aforementioned Fluidbox, or this interface (extract from the post linked): Sparked by the post linked — which you should read — I started goofing around with CSS transforms and transitions a bit. The […]


I adore the smooth transition offered by Medium’s lightbox module — no disruptive modal window, and opening/closing of the lightbox is intuitive and straightforward. So I tasked myself with a little challenge — replicate it, and improve on it, if possible. CSS transitions and transforms FTW Fluidbox Demo → Fluidbox Source (GitHub) → Fluidbox Explanation →

Skrollr – CSS animations linked to scroll position

Having seen a few single-page year in review minisites the past few weeks, it’s clear that Skrollr has become the de facto standard to implement parallax scrolling effects into your websites. The idea behind Skrollr is straightforward: link a target CSS property+value to a given scroll position, via data-* attributes: <div id="example" data-0="width:100%;" data-1500="width:0%;"></div> Skrollr […]


Myth lets you write pure CSS while still giving you the benefits of tools like LESS and Sass. You can still use variables and math functions, just like you do in preprocessors. It’s like a polyfill for future versions of the spec. Dubbed a CSS postprocessor Myth – CSS the way it was imagined →