.box { border:1px solid gray; background-color:transparent; color:black; padding:10px; margin:5px; }

.whitebox { border:1px solid black; background-color:white; color:black; padding:10px; margin:5px; }
.blackbox { border:1px solid white; background-color:black; color:white; padding:10px; margin:5px; }

.content_left {margin-left: 10px;}