/* =Clearfix (all browsers)
--------------------------------*/
.clearfix:after, .contenido:after {
content: ".";
display: block;
height: 0;
clear: both;
visibility: hidden;
}
/* IE6 */ 
* html .clearfix, * html .contenido {height: 1%;}
/* IE7 */
*:first-child+html .clearfix,
*:first-child+html .contenido
 {min-height: 1px;}