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HTML

              
                <!-- For Microsoft Edge Flexbox implementation details, see https://msdn.microsoft.com/en-us/library/bg124109 -->
<header>header</header>
<section id="flexContainer">
  <nav>navigation</nav>
  <section id="content">section</section>
  <aside>aside</aside>
</section>
<footer>footer</footer>
              
            
!

CSS

              
                body {
  font-family: Arial, Helvetica, Sans-Serif;
  font-size: 20px;
  background: #EDEDED;
}

#flexContainer {
  /* Specifies that the contents will be laid out according to Flexbox rules. */
  display: flex;
}

header {
  background: #707070;
  min-height: 100px;
  margin: 3px;
  padding: 3px;
}

nav {
  background: #C9BFBF;
  /* Shorthand property specifying flex-grow, flex-shrink, and flex-basis. */
  flex: 1 1 15%;
  min-width: 150px;
  margin: 3px;
  padding: 3px;
}

aside {
  background: #C9C9C9;
  /* Shorthand property specifying flex-grow, flex-shrink, and flex-basis. */
  flex: 1 1 15%;
  min-width: 150px;
  padding: 3px;
  margin: 3px;
}

#content {
  min-height: 800px;
  background: #ABABAB;
  /* Shorthand property specifying flex-grow, flex-shrink, and flex-basis. */
  flex: 2 1 70%;
  margin: 3px;
  padding: 3px;
}

footer {
  background: #707070;
  min-height: 50px;
  margin: 3px;
  padding: 3px;
}


/* When the page is resized, use the styles below */

@media all and (max-width: 640px) {
  #flexContainer {
    /* Shorthand property specifying flex-direction and flex-wrap */
    flex-flow: column wrap;
  }
  header {
    min-height: 75px;
  }
  nav {
    min-height: 50px;
    /* Specifying the order so the nav appears as the first item in the flex container */
    order: 1;
  }
  aside {
    min-height: 50px;
    /* Specifying the order so the nav appears as the second item in the flex container */
    order: 2;
  }
  #content {
    /* Specifying the order so the nav appears as the third item in the flex container */
    min-height: 725px;
    order: 3;
  }
  footer {
    min-height: 25px;
  }
}
              
            
!

JS

              
                
              
            
!
999px

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