.loader {
  position: absolute;
  left: 50%;
  top: 50%;
  z-index: 1;
  /*width: 150px;
  height: 150px;
  width: 40px;
  height: 40px;*/
  margin: -75px 0 0 -75px;
  border: 10px solid #f3f3f3; /*lebar garis*/
  border-radius: 50%;
  border-top: 10px solid green; /*lebar garis*/
  width: 60px; /*besar loader*/
  height: 60px; /*besar loader*/
  -webkit-animation: spin 2s linear infinite;
  animation: spin 2s linear infinite;
}

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

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