.centerDiv {
    width: 120px; height: 120px; position: absolute;
    top:0;
    bottom: 0;
    left: 0;
    right: 0;
    margin: auto;
}

.loader {
    border: 0px solid #f3f3f3; /* Light grey */
    border-top: 5px solid #3498db; /* Blue */
    border-radius: 50%;
    width: 50px;
    height: 50px;
    -webkit-animation: spin 2s linear infinite; /* Safari */
    animation: spin 2s linear infinite;
    margin: auto;
}
  
/* Safari */
@-webkit-keyframes spin {
    0% { -webkit-transform: rotate(0deg); }
    100% { -webkit-transform: rotate(360deg); }
}

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