html, body {
    height: 100%;
    font-family: 'Source Sans Pro', sans-serif;
    overflow: hidden;
  }
  
  .center {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
  }
  
  h1 {
    margin: 0 auto;
  }
  
  .letter {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 75px;
  }