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HTML 

              
                <header><h1>2-хколоночный flexbox макет</h1></header>
<div id="wrap">
  <section id="main">
    <h2>Макет с колонками одинаковой высоты</h2>
    <p>Базируется на свойстве flexbox</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Odio blanditiis voluptate necessitatibus ut, molestias. Nobis, id, magni. Sunt iste, tempora.</p>
    <p>Voluptate ducimus a, unde, expedita, pariatur nemo eligendi rem quos sapiente quas explicabo sit deleniti libero illo et mollitia molestiae.</p>
    <p>Magnam eos optio in dolores quis minus incidunt eum voluptas sint adipisci omnis deserunt, laborum delectus quisquam, odit dolorum, ullam.</p>
    <img src="http://lorempixel.com/800/400/city" alt="Picture" />
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Aspernatur at fuga sit debitis nostrum provident dignissimos minima velit deserunt, libero nam nisi magnam? Provident explicabo nostrum odio. Quos, autem, eligendi!</p>
    <p>Hic atque, soluta alias delectus, praesentium sequi distinctio deserunt, neque expedita enim reprehenderit doloribus labore quia aliquid ducimus, eum nam quibusdam libero. Quos laboriosam, a qui nostrum labore quod praesentium.</p>
    <p>Pariatur iste eos doloremque, commodi, fuga tempora deleniti illum dicta exercitationem quia nesciunt ipsum libero voluptas. Sunt maiores molestias, ut alias. Vero, consectetur animi reprehenderit perspiciatis ipsa fuga quasi ex?</p>
    </section>
   <aside>
     <ul>
       <h3>Категории</h3>
       <li><a href="#">Категория 1</a></li>
       <li><a href="#">Категория 2</a></li>
       <li><a href="#">Категория 3</a></li>
       <li><a href="#">Категория 4</a></li>
       <li><a href="#">Категория 5</a></li>
     </ul>
     <div class="advertizing">
       <img src="http://lorempixel.com/130/130/city/1" alt="" />
       <img src="http://lorempixel.com/130/130/city/7" alt="" />
       <img src="http://lorempixel.com/130/130/city/5" alt="" />
       <img src="http://lorempixel.com/130/130/city/4" alt="" />
     </div>
     <ul>
       <h3>Последние статьи</h3>
       <li><a href="#">Lorem ipsum dolor.</a></li>
       <li><a href="#">Dolore eaque, veniam.</a></li>
       <li><a href="#">Natus ducimus, tempore?</a></li>
       <li><a href="#">Vero, libero, rem.</a></li>
       <li><a href="#">Perspiciatis, vitae, temporibus.</a></li>
     </ul>
  </aside>  
</div>
<footer>Сделано на основе <a href="http://tutorialzine.com/2014/10/easiest-way-equal-height-sidebar/">статьи</a></footer>
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CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Arimo:400,700,400italic&subset=latin,cyrillic);

body{
  font-family: 'Arimo', sans-serif;
  background-color:#666;
  background-image: linear-gradient(45deg, transparent,transparent 48%, rgba(255,255,255,.3) 48%, rgba(255,255,255,.3) 52%, transparent 52%);
  background-size:10px 10px;
  margin: 0;
}
header, footer {
  padding: 15px;
  text-align: center;
  background-color: #111;
  color: #fff;
}
header {box-shadow: 0 0 4px #222;}
footer {box-shadow: 0 0 4px #222}
footer a {color: #aaa;}
img {max-width: 100%;}
#wrap {
    background-color: #fff;
    display:flex;

    /* Centering the page */
    max-width:1200px;
    margin:0 auto;
}
#main, aside {
  padding: 15px;
}
#main {
    /* This makes the element grow and take all available space, not taken by the sidebar */
    flex-grow: 1;
}
aside {
    /* Give the sidebar a default width, and prevent it from shrinking */
  flex-shrink: 0;
  width: 280px;
  background-color: #ccc;
}
.advertizing {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}
.advertizing img {
  margin-bottom: 10px;
}
aside ul {
  list-style-type: none;
  padding-left: 0;
}
aside ul li {
  margin-bottom: 10px;
  border-bottom: 1px dotted #222;
}
aside a {
  color: #222;
  text-decoration: none;
  transition: .3s;
}
aside a:hover {padding-left: 20px;}
@media all and (max-width: 800px) {

    #page {
        flex-flow: column;
    }

    /* Make the sidebar take the entire width of the screen */

    aside {
        width:auto;
    }
  .advertizing {display: block;}

}
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JS
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999px

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