* {
	box-sizing: border-box;
}

.col-1 {width: 8.33%;}
.col-2 {width: 16.66%;}
.col-3 {width: 25%;}
.col-4 {width: 33.33%;}
.col-5 {width: 41.66%;}
.col-6 {width: 50%;}
.col-7 {width: 58.33%;}
.col-8 {width: 66.66%;}
.col-9 {width: 75%;}
.col-10 {width: 83.33%;}
.col-11 {width: 91.66%;}
.col-12 {width: 100%;}

[class*="col-"] {
	float: left;
	padding: 15px;
}

.caja {
	border: 10px solid white;
	text-align: center;
	background-color: #333;
	border-radius: 20px;	
}

.caja:hover {
	background-color: #666;	
}

.caja a {
	color: white;
	font-weight: bold;
	text-decoration: none;
}