body
{background-color: aquamarine;}

h1
{color:darkblue;}

#result
{background-color:white;
text-align:center;}

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