/* Start by setting display:none to make this hidden.
   Then we position it in relation to the viewport window
   with position:fixed. Width, height, top and left speak
   for themselves. Background we set to 80% white with
   our animation centered, and no-repeating */

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    background: rgba( 255, 255, 255, .8) url('http://i.stack.imgur.com/FhHRx.gif') 50% 50% no-repeat;
}


/* When the body has the loading class, we turn
   the scrollbar off with overflow:hidden */

body.loading .modal {
    overflow: hidden;
}


/* Anytime the body has the loading class, our
   modal element will be visible */

body.loading .modal {
    display: block;
}

.loading-img {
    width: 100px;
}