#cover-spin {
  position:fixed;
  width:100%;
  left:0;right:0;top:0;bottom:0;
  background-color: rgba(255,255,255,0.7);
  z-index:9999;
  display:none; 
}

@-webkit-keyframes spin {
  from {-webkit-transform:rotate(0deg);}
  to {-webkit-transform:rotate(360deg);}
}

@keyframes spin {
  from {transform:rotate(0deg);}
  to {transform:rotate(360deg);}
}

#cover-spin::after {
  content:'';
  display:block;
  position:absolute;
  left:48%;top:40%;
  width:40px;height:40px;
  border-style:solid;
  border-color:black;
  border-top-color:transparent;
  border-width: 4px;
  border-radius:50%;
  -webkit-animation: spin .8s linear infinite;
  animation: spin .8s linear infinite;
}