.spinner {
    display: none;
    position: fixed;
    z-index: 1000;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    background: rgba(255, 255, 255, .8) url('../img/ajax-loader.gif') 50% 50% no-repeat;
}

/* Anytime the body has the loading class, our spinner element will be visible */
body.loading .spinner {
    display: block;
}