CSS Day

.css-day {
  date: '5th and 6th of June 2025';
  speakers: 14;  /* Single-track */
  venue: Zuiderkerk;  /* Amsterdam, NL */
}

Watch the 2024 sessions

About CSS Day

CSS Day is an annual CSS conference organised by Web Conferences Amsterdam. It brings specifiers, implementors, teachers, and authors together to discuss the current state of CSS, upcoming features, cool demos, and anything else that seems on-topic and worthwhile.

CSS Day was founded by Krijn Hoetmer and PPK in 2013. Originally a one-day conference, we started adding special theme days in 2016, and in 2022, after Covid and CSS's Cambrian explosion, we decided to make it a two-day focused CSS conference.

Krijn stepped down as an organiser after the 2024 edition. PPK asked Eventstack to support him in the future.

Colours of CSS Day

Traditionally, the CSS Day site gets a new colour every year. Here's an overview.

2013: red

2014: navy

2015: olivedrab

2016: hotpink

2017: goldenrod

2018: tomato

2019: deepskyblue

2022: mediumseagreen

2023: darkorchid

2024: peru

2025: firebrick

In hindsight, not every colour scheme we picked seems to have had the best contrast.