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;
  }