/* columnas responsive de minervaurora.blogspot.com */
 .fila, .col-2, .col-3, img{
  -webkit-box-sizing: border-box;
     -moz-box-sizing: border-box;
          box-sizing: border-box;
}
.fila {
  margin-right: -15px;
  margin-left: -15px;
}
.fila::after {
  clear: both;
}
.fila:before,
.fila:after{
  display: table;
  content: " ";
  -webkit-box-sizing: border-box;
     -moz-box-sizing: border-box;
          box-sizing: border-box;
}
.col-2, .col-3  {
  min-height: 1px;
  padding-right: 15px;
  padding-left: 15px;
  float: left;
  margin-top:0px;
  margin-bottom:0px;
}
.col-2 {
  width: 30%;
}
.col-3 {
  width: 33.33333333%;
}
.fila img{
  max-width:100%;
}
@media only screen and (min-width: 768px) and (max-width: 960px) {
.col-3 {
width: 50%;
}
}
@media only screen and (max-width: 767px) {
.col-2, .col-3{
width: 100%;
}
}
/* fin de columnas responsive */