[Kequc]

Skeleton is perfect.

https://github.com/dhg/Skeleton/blob/master/css/skeleton.css

It's tiny, simple, and so easy that if you read it and understand it, you could write it again yourself. It's meant to be tooled and modified to suit your needs. Bootstrap is just gigantic, it's a big unwieldily blunt instrument that eventually needs to be removed from the project.

The framework in OP bothers me because of the way it handles margins around components, makes unnecessary use of flexbox, and hides the entire sidebar of the page on mobile. Which I don't think will often be very useful.

I'm very opinionated about my css frameworks.

[xcatliu]

Skeleton is good, but not prefect on mobile.

You can try it on your iPhone http://getskeleton.com

As I tried, scrolling in a scroll-view (the overflow:auto section) is not smooth, <select> element is ugly, and the <pre><code> even not working (although it might be the website's problem, not the framework's, it proved that they didn't tested on mobile)

Skeleton has another major issue, it overrides the default styles of <input>s and <table>s, making it very hard to set it back. This is not friendly to third-party libraries. As far as I can see, no other frameworks did this.

[Kequc]

I haven't had any of those problems... but if you don't like something it does just delete those lines. I'm not hard line about these things, it's just my favourite one.