#html, #js {float:left; width:50%; height:100%;}
#auswahl, #bauhut {margin:0; height:50%;}
#html {background-color:hsl(120,30%,50%);}/*#66aa66*/
#js {background-color:hsl(240,30%,50%);}/*#6666aa*/
#html:hover {background-color:hsl(120,45%,60%);}/*#77bb77*/
#js:hover {background-color:hsl(240,45%,60%);}/*#7777bb*/
#auswahl {width:100%;}
#bauhut {width:100%; padding-top:1%; box-sizing:border-box; background-color:hsl(0,70%,80%);}/*#eeaaaa*/
#bauhut:hover {background-color:hsl(0,70%,85%);}