.app {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  background-color: #1e1e1e;
  color: white;
}

.display {
  width: 80%;
  height: 70vh;
  border: 2px solid #444;
  background: black;
}