/****** Grid ******/

div.sgrid {display: table;}
div.sgrid > div {display: table-row;}
div.sgrid > div > div {display: table-cell;}

div.grid {position: relative;}
div.grid > div.main, div.grid > div.over {position: absolute; top: 0; left: 0;}
div.grid > div.under {position: static;}