/* mask */
.sc-mask {
    background: rgba(0, 0, 0, 0.5);
    position: fixed;
    padding: 0px;
    margin: 0px;
    top: 0px;
    width: 100%;
    height: 100%;
    z-index: 99999;
    font-size: 72px;
}
.sc-mask > .overlay {
    position: fixed;
    padding: 0px;
    margin: 0px;
    top: 40%;
    left: 35%;
    width: 30%;
    text-align: center;
    color: rgb(0, 0, 0);
    cursor: wait;
}
.sc-mask > .overlay > img {
    -webkit-animation: loading 2s infinite linear;
    animation: loading 2s infinite linear;
    width: 60px;
}
@-webkit-keyframes loading {
    0% {
        -webkit-transform: rotate(0deg);
        transform: rotate(0deg);
    }
    100% {
        -webkit-transform: rotate(359deg);
        transform: rotate(359deg);
    }
}
@keyframes loading {
    0% {
        -webkit-transform: rotate(0deg);
        transform: rotate(0deg);
    }
    100% {
        -webkit-transform: rotate(359deg);
        transform: rotate(359deg);
    }
}