/* Style sheet that sets the shared background image for all pages */
body{
    background-color: lightgray;
    }

.bg{
    background-image: url("https://cdn.pixabay.com/photo/2016/11/29/05/45/astronomy-1867616__340.jpg");
    background-size: cover;
    background-repeat: round; 
    background-position: center center;
    height: 200%;
}