.loader-bg.loaderon{
display:block;
}
.loader-bg.loaderoff{
display:none;
}
.loader-bg{
    position:   fixed;
    z-index:    1000;
    top:        0;
    left:       0;
    height:     100%;
    width:      100%;
    background: rgba( 255, 255, 255, .8 );
    overflow: hidden;
}
.lds-dual-ring {
  position:absolute;
  display: inline-block;
  margin:0 auto;
  width: 50px;
  height: 50px;
  top:45%;
  left:0;
  right:0;
}
.lds-dual-ring:after {
  content: " ";
  display: block;
  width: 35px;
  height: 35px;
  margin: 4% auto;
  border-radius: 50%;
  border: 4px solid #000;
  border-color: #000 transparent #000 transparent;
  animation: lds-dual-ring 1.2s linear infinite;
}
@keyframes lds-dual-ring {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}


.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(0,0,0,.8);
    z-index: 999;
    opacity: 1;
    transition: all 0.5s;
}