Name,Version,Size (uncompressed),Size (minified),Size (gzipped),URL
Bootstrap,v3.3.7,143 KB,117 KB,20 KB,http://getbootstrap.com/css/
Bootstrap,v4.0.0,187 KB,147 KB,20 KB,https://v4-alpha.getbootstrap.com/
Materialize,v3.0 ,114 KB,90 KB,18 KB,http://materializecss.com/
Material Design Lite,v1.3.0,350 KB,137 KB,21 KB,https://getmdl.io/
mini.css,v2.1,47 KB,36 KB,7 KB,https://chalarangelo.github.io/mini.css/
Semantic UI,v2.2.6,730 KB,550 KB,95 KB,https://semantic-ui.com/
Foundation,v3.0,90 KB,64 KB,12 KB,http://foundation.zurb.com/
Pure CSS,v0.6.2,80 KB,17 KB,3.8 KB,https://purecss.io/
Picnic CSS,v6.3.2,55 KB,38 KB,7 KB,https://picnicss.com
Milligram,v1.3.0,10 KB,8 KB,2 KB,https://milligram.github.io/