#box {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 100;
    width: 100vw;
    height: 100vh;
    background-repeat: no-repeat;
    background-position: center;

    display: flex;
    justify-content: center;
    align-items: center;
    width: 100vw;
    height: 100vh;
    background-color: rgba(255,255,255,0.9);
}

.u-loading {

    width: 250px;
    height: 250px;
    position: absolute;
    top: 40%;
    left: 50%;
    -ms-transform: translateX(-50%);
    transform: translateX(-50%);
}


.u-loading__symbol {

    padding: 8px;
    animation: loading 3s infinite;
    border-radius: 5px;
}
.u-loading__symbol img {
    display: block;
    max-width: 100%;
    animation: loading-icon 3s infinite;
}
/*
@keyframes loading {
    0% {
        transform: perspective(250px) rotateX(0deg) rotateY(0deg);
        background-color: #ffffff;
    }
    15% {
        background-color: #ffffff;
    }
    16% {
        background-color: #ffffff;
    }
    50% {
        transform: perspective(250px) rotateX(180deg) rotateY(0deg);
        background-color: #ffffff;
    }
    65% {
        background-color: #ffffff;
    }
    66% {
        background-color: #ffffff;
    }
    100% {
        transform: perspective(250px) rotateX(180deg) rotateY(-180deg);
    }
}
@keyframes loading-icon {
    0% {
        transform: perspective(250px) rotateX(0deg) rotateY(0deg);
    }
    15% {
        transform: perspective(250px) rotateX(0deg) rotateY(0deg);
    }
    16% {
        transform: perspective(250px) rotateX(180deg) rotateY(0deg);
    }
    50% {
        transform: perspective(250px) rotateX(180deg) rotateY(0deg);
    }
    65% {
        transform: perspective(250px) rotateX(180deg) rotateY(0deg);
    }
    66% {
        transform: perspective(250px) rotateX(180deg) rotateY(180deg);
    }
    100% {
        transform: perspective(250px) rotateX(180deg) rotateY(180deg);
    }
}*/