.overlay_div {
    display:none;
    position:fixed;
    top:0px;
    left:0px;
    height:100%;
    width:100%;
    background-color: rgba(0,0,0,0.1);
    z-index:10000;
}

.overlay_div_text {
    position: absolute;
    content: "";
    display: block;
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    top: 50%;
    left: 50%;
    border: 2px solid #f3f3f3; /* Light grey */
    border-top: 2px solid #3498db; /* Blue */
    border-radius: 50%;
    animation: spin 2s linear infinite;
    z-index:10001;
}
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}
@keyframes Rotate {
    0% {
        transform: rotate(0deg);
    }
}
@keyframes Rotate {
    100% {
        transform: rotate(360deg);
    }
}