* {
  margin: 0;
  padding: 0;
}


.overlay {
  display: none;
  width: 100%;
  height: 100%;
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  margin: auto;
  z-index: 50;
  background-color: rgba(51,51,51, 0.7);
}

.overlay.ajax { z-index: 100; }

.overlay.ajax::after {
  content: '';
  display: inline-block;
  width: 100px;
  height: 100px;
  margin: auto;
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  background-repeat: no-repeat;
  background-position: 50%;
  background-size: 100%;
  background-image: url('loader.gif');
  -webkit-animation: rotateplane 1.2s infinite ease-in-out;
  animation: rotateplane 1.2s infinite ease-in-out;
}
@-webkit-keyframes 
rotateplane { 0% {
-webkit-transform: perspective(120px)
}
 50% {
-webkit-transform: perspective(120px) rotateY(0deg)
}
 100% {
-webkit-transform: perspective(120px) rotateX(-360deg)
}
}
@keyframes 
rotateplane { 0% {
 transform: perspective(120px) rotateX(0deg) rotateY(0deg);
 -webkit-transform: perspective(120px) rotateX(0deg) rotateY(0deg);
}
 50% {
 transform: perspective(120px) rotateX(0deg) rotateY(0deg);
 -webkit-transform: perspective(120px) rotateX(0deg) rotateY(0deg);
}
 100% {
 transform: perspective(120px) rotateX(-360deg) rotateY(0deg);
 -webkit-transform: perspective(120px) rotateX(-360deg) rotateY(0deg);
}
}