* {
    box-sizing: border-box;
  }
  
  body {
    background-color: black;
  }
  .postcard {
    width: 800px;
    height: 500px;
    background-color: #f7f7f7;
    margin: 0 auto;
    border-radius: 2%;
    display: flex;
    justify-content: space-between;
    padding: 3em;
    box-shadow: .8em .8em 15px rgba(0,0,0,.3);
    transition: all .5s ease;
  }
  
  h1 {
    text-align: center;
    font-size: 5em;
    color: #f7f7f7;
    margin-bottom: 10px;
  }

  h2 {
    text-align: center;
    font-size: 2em;
    color: #f7f7f7;
    margin-bottom: 20px;
  }
  footer {
    text-align: center;
    font-size: 1.5em;
    color: #f7f7f7;
    margin-bottom: 15px;
  }