#loading-overlay {
    position: absolute;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
    display: none;
    align-items: center;
    background-color: #000;
    z-index: 999;
    opacity: 0.5;
}

.loading-icon {
    position: absolute;
    border-top: 2px solid #fff;
    border-right: 2px solid #fff;
    border-bottom: 2px solid #fff;
    border-left: 2px solid #767676;
    border-radius: 25px;
    width: 25px;
    height: 25px;
    margin: 0 auto;
    position: absolute;
    left: 50%;
    margin-left: -20px;
    top: 50%;
    margin-top: -20px;
    z-index: 4;
    -webkit-animation: spin 1s linear infinite;
    -moz-animation: spin 1s linear infinite;
    animation: spin 1s linear infinite;
}

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

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

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