.loader {
     position: absolute;
  left: 50%;
  top: 50%;
  z-index: 1;
  width: 50px;
  height: 50px;
  margin: -40px 0 0 -34px;
  border: 5px solid #f3f3f3;
  border-radius: 50%;
  border-top: 5px solid #555;
  width: 50px;
  height: 50px;
  -webkit-animation: spin 2s linear infinite;
  animation: spin 2s linear infinite;
  z-index:200000000000;
}
#overlay {
    position: fixed;
    display: none;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0,0,0,0.7);
    z-index: 20000000000;
    cursor: pointer;
    opacity:1.5;

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