/*page loader*/
#page-loader.active {
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: #fff;
  position: absolute;
  position: fixed;
  z-index: 9999999;
  display: flex;
  align-items: center;
  justify-content: center;
}
#page-loader.active .loading {
  z-index: 1;
  margin: -75px 0 0 -75px;
  border: 5px solid #f3f3f3;
  border-radius: 50%;
  border-top: 5px solid #3498db;
  width: 50px;
  height: 50px;
  -webkit-animation: spin 2s linear infinite;
  animation: spin 2s linear infinite;
  vertical-align:middle;
  text-align:center;
  position: absolute;
  justify-content: center;
  display: flex;
  align-items: center;
  margin: auto;
}
@-webkit-keyframes spin {
  0% { -webkit-transform: rotate(0deg); }
  100% { -webkit-transform: rotate(360deg); }
}
@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}
/*Demo Code*/
/*page loader*/

@-webkit-keyframes spin {
  0% { -webkit-transform: rotate(0deg); }
  100% { -webkit-transform: rotate(360deg); }
}
@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}