#site-loader-container {
    position:absolute;
    top:0;
    left:0;
    width:100%;
    height:100%;
    z-index:1000;
    background-color: #f1f2f3;
}
#site-loader {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 150px;
    height: 150px;
    margin-left: -75px;
    margin-top: -75px;
}