#loader-bg {
display: none;
position: fixed;
width: 0px;
height: 0px;
top: 50%;
left: 50%;
background: #000;
z-index: 1;
}
#loader {
display: none;
position: fixed;
top: 50%;
left: 50%;
width: 100px;
height: 100px;
margin-top: -100px;
margin-left: -100px;
text-align: center;
color: #fff;
z-index: 2;
}