body {
    background-image: url("MoonImageITook.JPG");
    height: 1%;
    background-size: cover;
    background-repeat: repeat-y;
  }
  
h1 {
    color: white;
}
h2  {
    color: white;
}
h3  {
    color: white;
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html, body {
    height: 100%;
    border: green 2px solid;
}