.loading {
    width: 100%;
    height: 100%;
    background: #16171d;
    opacity: 0.9;
    position: fixed;
    z-index: 999;
    overflow: hidden;
    margin: auto;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
}

    .loading > div {
        width: 60px;
        height: 60px;
        position: absolute;
        left: 50%;
        margin-left: -30px;
        top: 50%;
        margin-top: -30px;
    }


        .loading > div > div {
            content: '';
            position: absolute;
            width: 16px;
            height: 16px;
            background: #ff8c00;
            top: 10px;
            left: 10px;
            transform-origin: 20px 20px;
            border-radius: 8px;
            animation: spin-a 2s infinite cubic-bezier(0.5, 0, 0.5, 1);
        }

        .loading > div > .c2 {
            top: 10px;
            left: auto;
            right: 10px;
            transform-origin: -4px 20px;
            animation: spin-b 2s infinite cubic-bezier(0.5, 0, 0.5, 1);
        }

        .loading > div > .c3 {
            top: auto;
            left: auto;
            right: 10px;
            bottom: 10px;
            transform-origin: -4px -4px;
            animation: spin-c 2s infinite cubic-bezier(0.5, 0, 0.5, 1);
        }

        .loading > div > .c4 {
            top: auto;
            bottom: 10px;
            transform-origin: 20px -4px;
            animation: spin-d 2s infinite cubic-bezier(0.5, 0, 0.5, 1);
        }

@keyframes spin-a {
    0% {
        transform: rotate(90deg);
    }

    0% {
        transform: rotate(90deg);
    }

    50% {
        transform: rotate(180deg);
    }

    75% {
        transform: rotate(270deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

@keyframes spin-b {
    0% {
        transform: rotate(90deg);
    }

    25% {
        transform: rotate(90deg);
    }

    25% {
        transform: rotate(180deg);
    }

    75% {
        transform: rotate(270deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

@keyframes spin-c {
    0% {
        transform: rotate(90deg);
    }

    25% {
        transform: rotate(90deg);
    }

    50% {
        transform: rotate(180deg);
    }

    50% {
        transform: rotate(270deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

@keyframes spin-d {
    0% {
        transform: rotate(90deg);
    }

    25% {
        transform: rotate(90deg);
    }

    50% {
        transform: rotate(180deg);
    }

    75% {
        transform: rotate(270deg);
    }

    75% {
        transform: rotate(360deg);
    }

    100% {
        transform: rotate(360deg);
    }
}


.loading > span {
    width: 100px;
    height: 30px;
    position: absolute;
    left: 50%;
    margin-left: -50px;
    top: 50%;
    margin-top: 30px;
    color: #ff8c00;
    font-size: 12px;
    text-align: center;
}

.content {
    padding: 0;
}