body {
    font-family: Tahoma, Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 10px;
    background-color: #ffffff;
    color: #111122;
  }

  header {
    text-align: center;
    padding: 20px;
    background-color: #ffffff;
    border-bottom: 1px solid #e0e0e0;
  }

  header h1 {
    font-size: 2.5em;
    color: #1f78b4;
    margin: 0;
  }

  nav ul {
    list-style: none;
    padding: 0;
    display: flex;
    justify-content: center;
    margin-top: 10px;
  }

  nav li {
    margin: 0 15px;
  }

  nav a {
    text-decoration: none;
    color: #1f78b4;
    font-size: 1em;
  }

  nav a:hover {
    text-decoration: underline;
  }

  main {
    padding: 40px 20px;
    max-width: 800px;
    margin: 0 auto;
    text-align: left;
  }
    h1 { 
      color: #1f78b4;
      text-align: center;
    }
    h3 { 
      color: #1f78b4;
    }

    aside {
        width: 30%;
        padding-left: 9px;
        margin-left: 5px;
        float: right;
        font-family: Tahoma, Arial, sans-serif;
        background-color: #d1e5f0;
    }
    
    button {
      background-color: #d1e5f0;
      border: 2px solid #2166ac;
      cursor: pointer;
      padding: 8px;
      border-radius: 3px;
    }
    button:hover {
        opacity: 0.7;
    }

    /* Borrowed from: https://www.w3schools.com/howto/howto_css_thumbnail.asp */
    .thumb {
      border: 1px solid #ddd;
      border-radius: 4px;
      padding: 3px;
      margin: 12px;    
      width: 175px;
    }
    .thumb:hover {
      box-shadow: 0 0 2px 1px rgba(0, 140, 186, 0.5);
    }

    figure {
      border: 1px solid #ddd;
      border-radius: 3px;
      padding: 15px;
    }

    footer {
      background-color: #1f78b4;
      height: 75px;
      padding: 10px; 
    }
    footer p {
        font-size: 20px;
        font-family: Tahoma, Arial, sans-serif;
        color: #fff;
        text-align: center;
        margin: 10px;
    }