* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: Arial, sans-serif;
      margin: 25px;
    }

    header {
      background-color: #339;
      padding: 1rem;
    }

    nav {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
    }

    nav a {
      color: white;
      text-decoration: none;
      padding: 0.5rem 1rem;
    }

    nav a:hover {
      background-color: #559;
    }

    @media (max-width: 600px) {
      nav {
        flex-direction: column;
        align-items: center;
      }

      nav a {
        width: 100%;
        text-align: center;
        border-top: 1px solid #444;
      }

      nav a:first-child {
        border-top: none;
      }
    }
    .blue-button {
      display: inline-block;
      background-color: #007BFF;
      color: white;
      text-decoration: none;
      padding: 0.5rem 1rem;
      border-radius: 999px;
      font-size: 1rem;
      font-family: sans-serif;
      transition: background-color 0.3s ease;
    }

    .blue-button:hover {
      background-color: #0056b3;
    }