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              <div class="conteneur-flexbox">
  <div class="colonne-une">
		<h3>1</h3>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Ipsam quasi similique amet voluptatem molestiae nostrum ab nesciunt blanditiis repellendus quos, sequi sunt, dolorem quis facilis mollitia nemo modi doloribus quo.</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Placeat quisquam, veritatis ducimus, vero magnam hic quia pariatur asperiores laudantium quod nobis perspiciatis, expedita quo reprehenderit quasi iusto ullam error reiciendis.</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Ipsam quasi similique amet voluptatem molestiae nostrum ab nesciunt blanditiis repellendus quos, sequi sunt, dolorem quis facilis mollitia nemo modi doloribus quo.</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Placeat quisquam, veritatis ducimus, vero magnam hic quia pariatur asperiores laudantium quod nobis perspiciatis, expedita quo reprehenderit quasi iusto ullam error reiciendis.</p>
  </div>

	
  <div class="colonne-deux">
    <div class="deux-a">
			<h3>2</h3>
		<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Placeat quisquam, veritatis ducimus, vero magnam hic quia pariatur asperiores laudantium quod nobis perspiciatis, expedita quo reprehenderit quasi iusto ullam error reiciendis.Lorem ipsum dolor sit amet, consectetur adipisicing elit. Placeat quisquam, veritatis ducimus, vero magnam hic quia pariatur asperiores laudantium quod nobis perspiciatis, expedita quo reprehenderit quasi iusto ullam error reiciendis.</p>
		</div>
    <div class="deux-b">
			<h3>3</h3>
		<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Placeat quisquam, veritatis ducimus, vero magnam hic quia pariatur asperiores laudantium quod nobis perspiciatis.</p>
		</div>
  </div>
</div>

            
          
!
            
              /*STYLES GLOBAL / À ADAPTER EN FONCTION DE VOS BESOINS*/
html, body {
  padding: 0;
  margin: 0;
}

body {
	background: #aae1ca; /*Back Office :) http://www.revue-backoffice.com/fr */
	font-family: 'Roboto Slab', serif;
	font-weight: 700;
}

h2, h3 {
  margin: 0 0 .75em 0;
}


/*FLEXBOX*/

.conteneur-flexbox {
  max-width: 1000px;
  margin: 100px auto;
	border: 3px solid black;
}

.colonne-une {
  /*background-color: #FFF;*/
  padding: 20px;
  flex: 1;
}

.colonne-deux {
  /*background-color: yellow;*/
  flex: 1;
  display: flex; /*on paramètre le conteneur pour devenir un conteneur flexbox. Du flexbox dans du flexbox : deux lignes dans une colonne*/
  flex-direction: column; /*les lignes 2 et 3 sont disposées l'une en dessous de l'autre car l'espace est distribué de façon vertical et non horizontal*/
	border-left: 3px solid black;
}

.deux-a {
  /*background-color: #c0dbe2;*/
	padding: 20px;
  flex: 1;
	border-bottom: 3px solid black;
}

.deux-b {
  /*background-color: #cdf1c3;*/
	padding: 20px;
  flex: 1;
}


/*VERSION RESPONSIVE*/

@media (min-width: 900px) {
  .conteneur-flexbox {
    display: flex; /*on ajoute display: flex; ici dans la media querie et non dans le style .layout global */
  }
}
            
          
!
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