.modal {
     display: none;
     position: fixed;
     z-index: 1000;
     top: 0;
     left: 0;
     height: 100%;
     width: 100%;
     background: rgba( 0, 0, 0, .9 ) url('../../source/assets/gif/loading.gif') 50% 50% no-repeat;
}
body.loading .modal {
     overflow: hidden;
}
body.loading .modal {
     display: block;
}