body {
  background-color: black;
}

.intro {
  background-color: lightblue;
  margin: 20px;
  padding: 20px;
  border-radius: 25px;
  text-align: center;
}

.else {
  background-color: lightgreen;
  margin: 20px;
  padding: 20px;
  border-radius: 25px;  
  text-align: center;
}

.final {
  background-color: gold;
  margin: 20px;
  padding: 20px;
  border-radius: 25px; 
  text-align: center;
}