body {
      text-align: center; 
      color: white;
      background-image: url(space.png);
    }
  button {
    color: #ffffff;
    background: linear-gradient(blue, darkblue);
  }
  .window {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 1vh;
    }