#loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.4);
    display: block;
    backdrop-filter: blur(2px);
    z-index: 9998;
}
#loading .spinner {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 50px;
    height: 50px;
    margin: -20px 0 0 -20px;
    border: 10px solid rgba(255,255,255,1);
    border-top: 10px solid rgba(255,255,255,0.2);
    border-radius: 50%;
    animation: loadingSpin 0.8s linear infinite;
    z-index: 9999;
}
@keyframes loadingSpin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}