body
{
  background-color: navy;
}

h1
{
  color: white;
}

label
{
  color: white;
} 
#result
{
  background-color: white;
  text-align: center;
}
#container
{
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: blue;
  border-radius: 5%;
  padding: 20px;
}