.loading_frame {
    background: #D8D8D8;
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    opacity: .4;
}

.windows8_wrap {
    position: fixed;
    top: 0;
    left: 0;
    margin: auto;
    bottom: 0;
    right: 0;
    background-image: url(../img/loading.gif);
    background-position: center;
    background-size: 300px;
    background-repeat: no-repeat;
}