@media only screen  and (min-width: 0px) and (max-width:767px) 
{
	.tab {
		margin-left: 25px;
		margin-top: 20px;
	}
	
	.contenedorAvisos {
		width: 100%;
	}
	
	.img-responsive{
		margin: 0 auto;
	}
}