.x4{width:100%;}
.x4 .cajita{width:22%;float:left; margin:1%; position:relative;}
.x4 .cajita .titulo{background-color:navy;color:white;font-weight:bold;text-align:center;font-family:"Times New Roman";font-size:25px;}
.x4 .cajita img{z-index:-1; position:absolute; top:0px; left:0px;}
.x4 .cajita .texto{ height:100px; width:150px;border:thin; padding-top:45px; padding-left:10px;}