.loading-spinner {
    background: #333;
    background: rgba(0, 0, 0, 0.8);
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    overflow: hidden;
    display: none;
}

.loading-spinner.active {
    display: block;
}

#hourglass { /* centraliza no meio da tela */
    position: absolute;
    top: 50%;
    left: 50%;
    margin: -32px 0 0 -32px;
}