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CSS Base

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              <div class="container">
  <header role="banner">
    <h1>Brand Name</h1>
    <nav>
      <ul>
        <li><a href="#main">Home</a></li>
        <li><a href="/about">About</a></li>
        <li><a href="/products">Products</a></li> 
        <li><a href="/login">Login</a></li>
      </ul> 
    </nav> 
  </header>
  <main id="main">
    <h2>Content goes here</h2>
    
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Consectetur deserunt, suscipit velit itaque vitae necessitatibus, impedit pariatur eos. Pariatur beatae sed repellendus iusto doloribus quidem asperiores quia exercitationem sint dicta!</p>
    
  </main>
</div>
            
          
!
            
                /* Float fallback for browsers that don't support flex. This is not a full fallback for all cases. */

  h1, li a {
    min-height: 0;
    padding: .8em;
    display: block;
  }
  h1, nav {
    position: static;
  }
  main {
    display: block;
    padding: .8em;
  }

  /* floats instead of flex the navbar */
  li {
    float: left;
    width: 25%;
  }

  /* Clearfixes the nav unorder list */
  ul:after {
    content: "";
    display: table;
    clear: both;
  }

  /* Defuault styles:
  width: narrow,
  orientation: portrait,
  update: slow,
  scan: interlace,
  monochrome: 1,
  pointer: coarse,
  hover: none
  */

  /* Creates large touch areas for finguers (coarse) */
  @supports (display: flex) {
    li a {
      min-height: 4em;
    }

    /* Positions the navbar at the bottom for easy thumb access on small devices with portrait orientation */
    h1, nav{
      position: fixed;
      left: 0;
      right: 0;
    }

    /* Moves the main area to accomodate fixed header and navbar */
    main {
      display: block;
      padding: 1em;
      padding-bottom: 5em;
      padding-top: 5em;
    }
  }

  /* Mobile first: Accomodates the brand name on the left and the navigation on the right and it wraps without the need of width media queries */

  header {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
  }

  /* Center aligns the brand name */

  @supports (display: flex) {
    h1 {
      min-height: 2.5em;
      padding: 0 1em;
      display: flex;
      align-items: center;
      flex: 1 0 auto;
    }
  }

  /* Flex items to make them streach */
  nav {
    bottom: 0;
    display: flex;
    flex: 1 0 auto;
  }

  ul, li, li a {
    display: flex;
    flex: 1;
    text-align: center;
  }
  li a {
    border-left: 1px solid black;
  }

  @supports (display: flex) {
    li a {
      flex: 1;
      align-items: center;
      justify-content: center;
      padding: 0 1em;
      border-left: 1px solid black;
    }
  }
  li:first-child a {
    border: none;
  }

  /* Detaches the fixed header and navbar for landscape viewports, fine pointers like a mouse and large screens */
  @media (orientation: landscape), (pointer: fine), (min-width: 45em) {
    main {
      padding-bottom: 1em;
      padding-top: 1em;
    }
    h1, nav {
      position: static;
    }
  }

  /* Makes hit areas smaller for fine pointers like a mouse to gain viewport realestate */
  @media (pointer: fine) {
    li a {
      min-height: 2.5em;
    }
  }


  /* Creates a vertical navigation on large landscape viewports */
  @media (orientation: landscape) and (min-width: 45em) {
    .container {
      display: flex;
    }

    header {
      display: block;
      flex: 0 0 20%;
    }

    h1{
      min-height: 6em;
    }

    @supports (display: flex) {
      ul, li {
        display: block;
        float: none;
        width: auto;
      }
    }

    li a, li:first-child a {
      justify-content: start;
      border-left: 0;
      border-bottom: 1px solid black;
    }
  }

  /* Adds an animation on devices that are capable to render animations smoothly. Filters devices like Kindles, TVs, touch devices */
  @media (update: fast), (scan: progressive), (hover: hover) {
    li a {
      transition: all 0.3s ease-in-out;
    }
  }

  /* Removes underlines on links for color screens */
  @media (color) {
    li a { text-decoration: none; }
  }

  /* Increases borders to 2px on interlace screens like plasma TVs */
  @media (scan: interlace) {
    li a, li:first-child a {
      border-width: 2px;
    }
  }

  /* General make up: colors, fonts, etc */
  html, body, .container { box-size: border-box; height: 100vh; }
  body { font-family: sans-serif; line-height: 1.5; }
  header { background: #393f44; border-top: 4px solid #00a8e1; color: white; }
  nav { background: #292e34; }
  h1 { background: #030303; font-weight: bold; }
  li a { color: #ccc; }
  li a:hover { background: #393f44; color: white }
  h2, p { margin-bottom: 1em; }
  h2 {font-weight: 700; }
            
          
!
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