@keyframes loading-spin-1 {
    0% {
        transform: rotate(0deg);
    }
    12.5% {
        transform: rotate(180deg);
    }
    37.5% {
        transform: rotate(-180deg);
    }
    50% {
        transform: rotate(0deg);
    }
    75% {
        transform: rotate(360deg);
    }
    100% {
        transform: rotate(0deg);
    }
}

#loading-masks, #error-mask {
    position: fixed;
    left: 0; top: 0; width: 100%; height: 100%;
    background-color: white;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    word-break: break-all;
    white-space: pre-wrap;
}
#loading-masks {
    font-size: 5rem;
    font-family: monospace;
}

.loading-mask {
    animation: loading-spin-1 2s linear infinite;
}
#loading-masks.slow .loading-mask {
    animation: loading-spin-1 5s linear infinite;
}