.minha_classe {
width:300px;
height:200px;
background-color:#000000;
text-align:center;
color:#FFFFFF;
font-weight:bold;
}

.tab{
	width: 71px;
	height: 240px;
	border: none;
	float: left;
}

.box{
	width: 715px;
	height: 240px;
	display: none;
	float: left;
}