:root {
    /* loading */
    --loading-bg-color: rgba(0, 0, 0, 0.5);
    --loading-spinner-color: #1b1b1b;
}

/* Loading Page */
.loading-hidden {
    display: none;
}

#loading-screen {
    text-align: center;
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    background-color: var(--loading-bg-color);
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--loading-spinner-color);
    z-index: 9999;
    opacity: 1;
    transition: opacity 1s ease-out;
}

.loading-screen-hidden {
    opacity: 0;
    transition: opacity 1s ease-out;
}

.loader {
    position: relative;
    width: 85px;
    height: 50px;
    background-repeat: no-repeat;
    background-image: linear-gradient(#FFF 50px, transparent 0),
    linear-gradient(#FFF 50px, transparent 0),
    linear-gradient(#FFF 50px, transparent 0),
    linear-gradient(#FFF 50px, transparent 0),
    linear-gradient(#FFF 50px, transparent 0),
    linear-gradient(#FFF 50px, transparent 0);
    background-position: 0px center, 15px center, 30px center, 45px center, 60px center, 75px center, 90px center;
    animation: rikSpikeRoll 0.65s linear infinite alternate;
}

@keyframes rikSpikeRoll {
    0% {
        background-size: 10px 3px;
    }
    16% {
        background-size: 10px 50px, 10px 3px, 10px 3px, 10px 3px, 10px 3px, 10px 3px
    }
    33% {
        background-size: 10px 30px, 10px 50px, 10px 3px, 10px 3px, 10px 3px, 10px 3px
    }
    50% {
        background-size: 10px 10px, 10px 30px, 10px 50px, 10px 3px, 10px 3px, 10px 3px
    }
    66% {
        background-size: 10px 3px, 10px 10px, 10px 30px, 10px 50px, 10px 3px, 10px 3px
    }
    83% {
        background-size: 10px 3px, 10px 3px, 10px 10px, 10px 30px, 10px 50px, 10px 3px
    }
    100% {
        background-size: 10px 3px, 10px 3px, 10px 3px, 10px 10px, 10px 30px, 10px 50px
    }
}

#main-content {
    color: #000;
    padding: 20px;
    background-color: #fff;
}