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At several parts of this theme we turned for solutions to people who have open-sourced their hard work and we want to thank them especially. To mention a few:
Viljami Salminen for the responsive-navigation code.
The guys that created the Materialize framework, whose work on forms was used on a few elements.
Jonathan Neal for his Flexibility library that allows all of us to use flexbox without having to worry too much for old browsers.
Evie uses flexbox but includes the superb Flexibility library to make it work even on Internet Explorer 9+.
However, the targeted browsers are the last two versions of the major ones(Chrome, Firefox, Safari, Edge) and most modern mobile devices.
We are really excited to see what you will create with Evie and the ways you will choose to extend it. If you have created re-usable components that will be of value to others, please contact us or create a pull request on GitHub and we can start collaborating on it.
When Katerina had the idea for unDraw, we created really fast a set of style patterns, that would allow us to focus on more challenging aspects, like color transformations in real time.
This style actually managed to support the whole development of unDraw without slowing us down. So the thought was simple. To organize it a bit better and let it be useful for everyone.
We normally use the BEM methodology (a bit adjusted to our liking), but it would bloat and make the learning curve for Evie much steeper, so we tried to remove all such classes wherever we could and made sense.
This certainly is not a full-blown framework but we feel that it provides a great starting point for different websites and applications. We really can't wait to see what you can create with it!