//== loading 效果
.loading_wrapper {
    $loading-icon-size: 30px;

    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: $zindex-loading_wrapper;
    display: none;
    @include rgba-bg(rgba(255, 255, 255, 0.7));

    &.active {
        display: block;
    }

    & > i {
        position: absolute;
        top: 50%;
        left: 50%;
        margin-top: - ($loading-icon-size / 2);
        margin-left: - ($loading-icon-size / 2);
        font-size: $loading-icon-size;
        color: $brand-warning;
    }
}