.overlay {
background: #333;
opacity: 0.8;
position: fixed;
left: 0px;
top: 0px;
z-index: 999;
height: 100%;
width: 100%;
overflow: hidden;
display: none;
}
.overlay_loading {
width: 300px;
height: 300px;
position: absolute;
left: 50%;
top: 50%; 
margin-left: 150px;
margin-top: 50px;
z-index: 1000;
opacity: 100%; 
display: none;
}
#loadingIcon {
position: fixed;
width: 300px;
height: 300px;
display: none;
z-index:1000;
}