.caja_padre{border:0px solid red;margin-bottom:0px;}
	
.caja_float{float:left;border:0px solid green;}
	
.width_dos{width:100%;}
.width_tres{width:100%;}
.width_cuatro{width:100%;}
.width_cinco{width:100%;}


.width_40{width:100%;}
.width_20{width:100%;}

@media only screen and (min-width: 480px) {}

@media only screen and (min-width: 768px){
	.width_dos{width:50%;}
.tres{display:none;}
}		

@media only screen and (min-width: 1024px){

	.width_dos{width:33.33%;}
	
	.dos{display:none;}
	.tres{display:block;}
	
	
	}

@media only screen and (min-width: 1280px){}