body
{
  background-color: mediumseagreen;
}

h1 {
 color: darkgreen; 
}

#result {
  background-color: white;
}

#container {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: lightgreen;
  border-radius: 5%;
  padding: 20px;
}