body {
  margin-right: 10%;
  margin-left: 10%;
  top: 10%;
  font: 14px "Lucida Grande", Helvetica, Arial, sans-serif;
  background-color: #000817;
}

* {
  color: #d3e5ff;
}

button {
  background-color: #003fa8;
  border-radius: 5px;
  color: #000817;
  border: 0;
  padding: 1.5em;
}

#result {
  color: #a2f384;
  font-size: 4em;
}