.caja {
   margin:0px auto 0px auto;	
   border:0px solid #335897;
   height:25px;
   overflow: hidden;
   width: 230px;
   position:relative;
}
.caja select {
   background: #ffffff;
   border: none;
   font-size: 12px;
   height: 25px;
   padding: 5px;
   width: 250px;
}
.caja select:focus{ outline: none;}

.caja::after{
	content:"\025be";
	display:table-cell;
	padding-top:2px;
	text-align:center;
	width:30px;
	height:25px;
	background-color:#bbcce8;
	position:absolute;
	top:0;
	right:0px;	
	pointer-events: none;
}