.loading-box{
    z-index: 9999;
    width: 100%;
    height: 100%;
    position: fixed;
    left: 0;
    top: 0;
    background-color: rgba(0,0,0,0.6);
}

.loading {

    position: fixed;
    left: 50%;
    top: 50%;
    border: 8px solid #f8f8f8;
    border-radius: 50%;
    border-top: 8px solid #3498db;
    width: 40px;
    height: 40px;
    -webkit-animation: spin 1s linear infinite;
    animation: spin 1s linear infinite;
    margin-left: -20px;
    margin-top: -40px;
}
@-webkit-keyframes spin {
    0% { -webkit-transform: rotate(0deg); }
    100% { -webkit-transform: rotate(360deg); }
}
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}