.loading {
    background: #000 url('../image/loading.gif') no-repeat center center;
    width: 100%;
    height: 100%;
    position: fixed;
    z-index: 5;
    top: 0;
    left: 0;
}
.loading span {
    position: absolute;
    top: 54%;
    left: 50%;
    margin-left: -35px;
    color: #FFF;
    font-weight: bold;
}