I recently made a simple layout with flexbox with about 60 lines of css (header, content area with two sidebars and footer) that would've taken either 500 lines

I recently made a simple layout with flexbox with about 60 lines of css (header, content area with two sidebars and footer) that would've taken either 500 lines of css or had to pull in whole css frameworks to do it. Flexbox is pretty close to what we are used to on desktop applications. Using almost no absolute pixel sizes and none of the usual suspects (clearfix, floats, position: absolute, z-index: 9999 ...none of that crap).