body {
    margin: 0;
    padding: 0;
    font-size: 1.2rem;
    text-align: center;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  }
  header {
    padding: 10px 25px;
    background-color: lightgrey;
    color: white;
    margin-bottom: 20px;
  }
  main {
    margin-bottom: 40px;
  }
  .instructions-text {
    font-size: 2rem;
  }

  .memory-image {
    width: 100%;
    max-width: 800px;
  }

  .switch-button {
    background: #191094;
    background-image: -webkit-linear-gradient(top, #3498db, #2980b9);
    background-image: -moz-linear-gradient(top, #3498db, #2980b9);
    background-image: -ms-linear-gradient(top, #3498db, #2980b9);
    background-image: -o-linear-gradient(top, #3498db, #2980b9);
    background-image: linear-gradient(to bottom, #3498db, #2980b9);
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    color: #ffffff;
    font-size: 1.7rem;
    padding: 15px 40px 14px 40px;
    text-decoration: none;
    border: none;
    border-radius: 10px;
    margin-bottom: 20px;
  }
  
  .switch-button:hover {
    background: #3cb0fd;
    background-image: -webkit-linear-gradient(top, #3cb0fd, #3498db);
    background-image: -moz-linear-gradient(top, #3cb0fd, #3498db);
    background-image: -ms-linear-gradient(top, #3cb0fd, #3498db);
    background-image: -o-linear-gradient(top, #3cb0fd, #3498db);
    background-image: linear-gradient(to bottom, #3cb0fd, #3498db);
    text-decoration: none;
  }

  footer {
    background-color: aliceblue;
    padding: 15px 30px;
    border-top: 1px solid lightblue;
  }

  .num-counter {
    padding: 5px 10px;
    background-color: black;
    color: white;
    font-weight: bold;
  }