#loading {
    display:none;
    position:fixed;
    left:0;
    top:0;
    width:100%;
    height:100%;
    background:rgba(0,0,0,0.75);
    z-index:99999;
    }
  
#loadingcontent {
    display:table;
    position:fixed;
    left:0;
    top:0;
    width:100%;
    height:100%;
    }
  
#loadingspinner {
    display: table-cell;
    vertical-align:middle;
    width: 100%;
    text-align: center;
    font-family: Arial;
    font-size:larger;
    padding-top:100px;
    color: #fff;
    }