*, *::after, *::before {
      box-sizing: border-box;
  }

  :root {
    font:1.2em/1.4 Arial, Helvetica, sans-serif;
  }

  body {
    padding: 0 0 1em;
  }

  header {
    background-color: #333;
    color: #fff;
    border: 5px solid #000;
  }

  header ul {
    list-style: none;
    margin: 0;
    padding: 0;
  }

  header a {
    color: #fff;
    text-decoration: none;
    display: block;
    padding: 0.5em 1em;
    border-top: 1px solid #999;
  }

  header .title {
    font-size: 150%;
    font-style: italic;
    font-weight: bold;
    padding: 1em;
  }

  main {
    padding: 0 1em;
  }

  .cards {
    list-style: none;
    margin: 0;
    padding: 0;
  }

  .cards li {
    border: 5px solid #000;
    margin-bottom: 1em;
  }

  .cards h2 {
    background-color: #333;
    color: #fff;
    margin: 0;
    padding: 0.5em 1em;
  }

  .cards .inner {
    padding: 0.5em 1em;
  }

  .sidebar {
    background-color: #333;
    border: 5px solid #000;
    padding: 0.5em 1em;
    color: #fff;
  }

  @media(min-width: 40em) 
  {

    main
    {
      display: flex;
      padding-block: 1rem;
      gap: 1rem;
      article{
        .cards 
          {
          gap:1rem;
          display: flex;
          flex-wrap: wrap;
          flex-direction: row;
          width: -10rem;


          li
          {
            width:30%;
            min-width: 18rem;
          }
        }
      }

      .sidebar 
      {
        width: 110rem;
      } 
    }


    header
      {
        display: flex;
          justify-content: space-between;
          
          .title 
          {
            padding: 1rem 2rem;
          }
        nav
        {
          display: flex;
          justify-content: right;
          text-decoration: none;
          margin-top: 1rem;
          ul
          {
            display: flex;
            flex-direction: row;
            li{
              a{
                border: none;
              }
              
            }
          }
        }
      }
    }
 
    
@media(min-width: 80rem)
{
  body{
    max-width: 80rem;
    margin-inline: auto;
    
  }
}