body {
    margin:0;
}

.preBody {
    z-index: 1000;
    position: absolute;
    top: 0px;
    bottom: 0px;
    width:100%;
    height: 100%;
}

.precontent {

}


#slideSource {
  opacity: 1;
  transition: opacity 1s;
}

#slideSource.fade {
  opacity: 0;
}