body {
  background-image: url(https://upload.wikimedia.org/wikipedia/commons/thumb/2/22/Amazon_Rainforest_%28Detail%29.jpg/960px-Amazon_Rainforest_%28Detail%29.jpg);
  background-size: cover;
  color: black;
  font-family: Verdana;
}

#intro {
  background-color: gold;
  color: purple;
}

section, footer {
  margin: 1em 0.5em;
  padding: 3px 1em;
  background-color: purple;
  color: lightyellow;
  
  border-color: darkgreen;
  border-radius: 30px;
  border-width: 3px;
  border-style: groove;
}

footer {
  background-color: gold;
  color: purple;
  
  margin-top: 300px;
}