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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              <h1>Une page utilisant les grilles et le flexbox ? Facile !</h1>
<header>
  <nav>
    <div class="conteneur-nav">
      <label for="mobile">Afficher / Cacher le menu</label>
      <input type="checkbox" id="mobile" role="button">
      <ul>
        <li class="deroulant"><a href="#">Cours Complets &ensp;</a>
          <ul class="sous">
            <li><a href="#">Cours HTML et CSS</a></li>
            <li><a href="#">Cours JavaScript</a></li>
            <li><a href="#">Cours PHP et MySQL</a></li>
          </ul>
        </li>
        <li class="deroulant"><a href="#">Articles &ensp;</a>
          <ul class="sous">
            <li><a href="#">CSS display</a></li>
            <li><a href="#">CSS position</a></li>
            <li><a href="#">CSS float</a></li>
          </ul>
        </li>
        <li><a href="#">Contact</a></li>
        <li><a href="#">A propos</a></li>
      </ul>
    </div>
  </nav>
</header>

<section class="conteneur">
  <aside class="g1"><p>Aside n°1</p></aside>
  <aside class="g2"><p>Aside n°2</p></aside>
  <article class="g3 sousconteneur">
    <header>
      <h1>Titre de l'article</h1>
      <p>Temps de lecture : 3mn</p>
      <nav>
        <ul>
          <li><a href="#">Chapitre 1</a></li>
          <li><a href="#">Chapitre 2</a></li>
          <li><a href="#">Chapitre 3</a></li>
        </ul>
      </nav>
    </header>
    <article>
      <p>Le sujet de cet exercice est d'apprendre à créer
        une page avec un design complexe et flexibles</p>
    </article>
    <footer>
      <p>A propos de l'auteur : Pierre Giraud...</p>
    </footer>
  </article>
  <aside class="g4"><p>Aside n°3</p></aside>
  <aside class="g5"><p>Aside n°4</p></aside>
</section>

<footer>
  <p>Page HTML / CSS avec grid et flexbox</p>
  <p>© Pierre Giraud / https://www.pierre-giraud.com</p>
</footer>
            
          
!
            
              *{
  font-family: Avenir, sans-serif;
  font-size: 1em;
  margin: 0px;
  padding: 0px;
  box-sizing: border-box;
}
h1{
    font-size: 1.5em;
    margin: 20px auto;
    text-align: center;
    text-transform: uppercase;
}
body > header{
    position: sticky;
    top: 0px;
}
body > header > nav{
    width: 100%;
    height: 42px;
    margin: 0 auto;
}
.conteneur-nav{
    position: absolute;
    width: 100%;
}
body > header > nav input[type=checkbox]{
    display: none;
}
body > header > nav label{
    display: inline-block;
    width: 100%;
    padding: 10px 0px;
    text-align: center;
    background-color: RGBa(220,220,220,0.5);
}
body > header > nav ul{
    display: none;
    list-style-type: none;
    background-color: #555;
}
body > header > nav input[type=checkbox]:checked + ul{
    display: flex;
    flex-flow : column wrap;
}
body > header > nav ul li{
    flex: 1 1 auto;
    text-align: center;
}
body > header > nav > div > ul > li > a{
    color: white;
}
body > header > nav a{
    display: block;
    text-decoration: none;
    color: black;
    padding: 10px 0px;
}
.sous{
    display: flex;
    flex-flow: column wrap;
    z-index: 1000;
}
.sous li{
    flex: 1 1 auto;
    text-align: left;
}
.sous a{
    padding: 10px;
    background-color: RGBa(200,200,200,0.8);
}

.conteneur{
    display: flex;
    flex-flow: column wrap;
}
.g1, .g4{background-color: RGBa(120,205,225,0.4);}
.g2, .g5{background-color: RGBa(225,100,175,0.4);}
.g1, .g2, .g4, .g5{min-height: 100px;}
.sousconteneur{
    display: flex;
    flex-flow: column wrap;
    text-align: center;
    background-color: RGBa(225,215,120,0.4);
}
.sousconteneur h1{
    font-size: 1.2em;
    margin: 10px 0px 0px 0px;
}
.sousconteneur nav ul{
    display: flex;
    flex-flow: row wrap;
    list-style-type: none;
    justify-content: space-around;
}
.sousconteneur nav a{
    display: block;
    color: #333;
}
.sousconteneur article{
    margin: 10px;
}
.sousconteneur footer{
    margin-bottom: 10px;
}

body > footer{
    width: 100%;
    height: 100px;
    background-color: #555;
    color: white;
    text-align:center;
    padding: 20px;
}

@media screen and (min-width: 980px){
    .conteneur-nav{
        position: static;
    }
    body > header > nav label, nav input{
        display: none;
    }
    body > header > nav input[type=checkbox]:checked + ul, body > header > nav ul{
        display: flex;
        flex-flow: row wrap;
        background-color: RGBa(220,220,220,0.5);
    }
    body > header > nav ul li{
        position: relative;
    }
    body > header > nav > div > ul > li > a{
        color: black;
    }
    body > header > nav a{
        border-bottom: 2px solid transparent;
    }
    body > header > nav a:hover{
        color: orange;
        border-bottom: 2px solid gold;
    }
    .sous{
        display: none;
        box-shadow: 0px 1px 2px #CCC;
        background-color: white;
        position: absolute;
        width: 100%;
    }
    body > header > nav > div > ul li:hover .sous{
        display: flex;
        flex-flow: column wrap;
    }
    .sous a{
        border-bottom: none;
        background-color: white;
    }
    .sous a:hover{
        border-bottom: none;
        background-color: RGBa(200,200,200,0.1);
    }
    .deroulant > a::after{
        content:" ▼";
        font-size: 12px;
    }
    .conteneur{
        display: grid;
        grid-template-columns: 1fr 2fr 1fr;
        grid-template-rows: repeat(2,minmax(300px, 1fr));
    }
    .g1{
        grid-column: 1 / 2;
    }
    .g2{
        grid-column: 1 / 2;
        grid-row: 2 / 3;
    }
    .g3{
        grid-column: 2 / 3;
        grid-row: 1 / 3;
    }
    .g4{
        grid-column : 3 / 4;
    }
    .g5{
        grid-column : 3 / 4;
        grid-rows: 2 / 3;
    }
}
            
          
!
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