.loader {
  position: fixed;
  left: 0px;
  top: 0px;
  width: 100%;
  height: 100%;
  z-index: 9999;
  background: url("../images/loader/cargando2.gif");
  background-position: center;
  background-repeat: no-repeat;
  background-size: 50%;
  opacity: 0.8;
}