We've just published a post explaining that "Bootstrap's popularity grew 1,000% in 3 years". It's clear that Bootstrap is the most popular design framework in the world.

If you haven't used it before, Bootstrap is an HTML, CSS and Javascript framework that allows you to create clean-looking websites. Bootstrap provides pre-built code that solves many of the tricky elements, such as responsiveness, that slow down web projects.

This week, to celebrate Bootstrap's growth, we've made two Bootstrap classes free to watch at OSTraining. All these videos will be available to non-members until Friday night.