Kilian Valkhof

Front-end developer, user experience designer & Jedi.

CSS hexadecimal colors with transparency, a conversion tool

CSS & HTML, 24 October 2016, 2 comments

This notation works with both 8 digits and 4 digits (shorthand notation)

In both Chrome and Firefox, you can now use hexadecimal notation to describe semitransparent colors, by adding an extra pair of digits to the end of a hexadecimal notation.

Recent articles

FromScratch 1.2.0: search and more Apps, 17/10, 0

FromScratch, the autosaving note taking app I built, just got another update: it now has additional search and replace functionality. It continues to do great in terms of downloads, I’m very happy that this tool helps so many other people.

Writing CSS in Dutch using PostCSS CSS & HTML, 3/07, 0

Many years ago there were a couple of developers that made a Dutch version of CSS but unfortunately that version got lost to history. When I encountered a PostCSS plugin to translate CSS to German, I decided to create a new Dutch version of CSS: postcss-dutch-stylesheets.

Projects & Work


FromScratch is a cross-platform, simple but smart autosaving scratchpad.


SenCSs supplies sensible styling for all repetitive parts of your CSS, allowing you to focus on actually developing your website's style.


Grafico is an opinionated javascript SVG charting library with a wide array of graphs and a feature-full API.


Trimage image compressor is a cross-platform GUI front-end to losslessy compress PNG and JPG images.