#header {
  color:white;
	background-color:#3009b0 ;
  text-align: center;
  font-family: Lobster;
   padding: 30px;
}

#header:hover {
 color: white;
 background-image: url("https://images.newscientist.com/wp-content/uploads/2019/07/02111520/gettyimages-157639696.jpg"); 
}

#content {
  background-color: #3009b0;
  padding: 10px 30px;
}
#content:hover {
 color: white;
 background-image: url("https://images.newscientist.com/wp-content/uploads/2019/07/02111520/gettyimages-157639696.jpg"); 
}
body {
 margin: 30px;
 color: white;
 background-color:#331b6b; 
}

iframe {
  height: 500px;
  width: 100%;
  background-color: white;
}

a {
  color: lightblue;
}

footer {
 margin: 10px 
}