.loader {
  position: fixed;
  left: 0px;
  top: 0px;
  width: 100%;
  height: 100%;
  z-index: 9999;
  background: url('../images/482.gif') 50% 50% no-repeat rgb(249,249,249);
  opacity: .8;
}

.centrar {
  position: relative;
  top: 50%;
  width: 100%;
  text-align: center;
}

.fondo {
  height: 100%;
  width: 0%;
  position: fixed;
  z-index: 1;
  top: 0;
  left: 0;
  background-color: rgb(1,1,1);
  background-color: rgba(1,1,1,0.5);
  overflow-x: hidden;
  transition: 0.2s;
}