html{
  background-image: url("/images/placeholder.png");
  background-repeat: no-repeat;
  background-size: cover;
}
h1{
 color: red; 
}
#contentDiv{
  background-color: lightgray;
  opacity: .7;
  display: block;
  margin: auto;
  width: 60vw;
  border: black 2px solid;
  height: 98vh;
  padding: 2vw;
}