#demo {
    border: 1px solid black;
}


body {
    background: url(bg.jpg) no-repeat center center fixed;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
}


/*On hover of img, flip image*/
img:hover {
    -webkit-transform: scaleX(-1);
    transform: scaleX(-1);

}
.background-image {
    position: fixed;
    background: url(bg.jpg);
     width: 1920px;
     height: 1080px;
     z-index: -1;
     filter: blur(4px);
   }