<!DOCTYPE html><html><head><title>mixins | Ribs
</title><meta charset="utf-8"><style>*{-moz-box-sizing:border-box;box-sizing:border-box;margin:0;padding:0;border:0}body{padding:60px 0 40px;background-color:hsl(207,10%,90%);color:hsl(207,5%,30%)}.container{max-width:1300px;margin:0 auto;padding:0 20px}.section{position:relative;margin-bottom:20px}.docs{position:relative;z-index:2;width:68%;min-height:200px;background-color:hsl(207,0%,100%);background-clip:padding-box;border:1px solid hsla(207,5%,5%,.1);borde