.lds-dual-ring.hidden { 
display: none;
}
.lds-dual-ring {
  display: inline-block;
  width: 80px;
  height: 80px;
}
.lds-dual-ring:after {
  content: " ";
  display: block;
  width: 64px;
  height: 64px;
  margin: 5% auto;
  border-radius: 50%;
  border: 6px solid #fff;
  border-color: #fff transparent #fff 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(51,51,255,.4);
    z-index: 999;
    opacity: 0.4;
    transition: all 0.5s;
}