.center-div {
    width: 300px;
    height: 300px;
    position: absolute;
    left: 50%;
    top: 60%;
    margin-left: -150px;
    margin-top: -150px;
}

.spinner {
    position: fixed;
    z-index: 999;
    height: 100%;
    width: 100%;
    top: 0;
    left: 0;
    background-color: Black;
    filter: alpha(opacity=60);
    opacity: 0.6;
    -moz-opacity: 0.8;
}

.loader {
    margin: auto;
    border: 16px solid #f3f3f3;
    border-radius: 50%;
    border-top: 16px solid #15a0ec;
    border-bottom: 16px solid #15a0ec;
    width: 120px;
    height: 120px;
    -webkit-animation: spin 2s linear infinite;
    animation: spin 2s linear infinite;
}

.inner-div {
    background-color: white;
    border-radius: 15px;
    margin: auto;
    padding: 2%;
    width: 150px;
}

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

     100% {
         -webkit-transform: rotate(360deg);
     }
 }

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

     100% {
         transform: rotate(360deg);
     }
 }