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HTML 

              
                <header>
  <div class="container">
  <h3>Header</h3>
  </div>
</header>

<section class="hero">
  <div class="container">
    <div class="hero-content">
  <h1>Flexbox Sticky Footer</h1>
      <h2>The simplest, hack-free way to make a sticky footer for modern web browsers.</h2> 
      <ul class="features">
        <li class="all-css">100% CSS</li> 
       <li class="js-free">JavaScript Free</li>
      </ul>
    </div>
    
  </div>
</section>

<main>
  <section class="intro">
  <div class="container">
    <h3>The Problem</h3>
    <p>On 'short' pages without much content, your footer rides up too high. I know. Embarassing, huh? This of course is not a new problem, but in the old-days before flexbox, we had to resort to using hacks or JavaScript to make our footers sticky. What a mess. Not any more.</p>
    
    <h3>The Fix</h3>
    <p> To use, make the body element the Flex Container and then add a flex-grow property to the main content area. No matter the content size, the div expands to take up any leftover space. See the commments in the CSS for more information.
      
    <h3>Resources</h3>
    <p>This pen was inspired by a number of articles inlcuding this one by <a href='https://philipwalton.github.io/solved-by-flexbox/demos/sticky-footer/'>Phillip Walton</a>.</p>
    <p>The image above was taken last year on my space vacation. I wish! No really, the hero image is a NASA photo I yanked from the wonderful free stock photo site, <a href="https://unsplash.com/photos/E7q00J_8N7A" target="_blank">Unsplash</a>.</p>
    
</div>
</section>
</main>

<footer>
  <div class="container">
    <h3>Sticky Footer</h3>
  </div>
</footer>
!

CSS 

              
                @inlcude "compass/css3";

/********************
The Flexbox Magic. 
********************/

body {
  display: flex; /* Make the body element a flex container */
  flex-direction: column; /* Change the flexbox axis from the default which is row*/
  height: 100%; /* I needed this */
  min-height: 100vh;  /* and this to make it work right */
}

main {flex: 1 auto;} /* Make the main content area grow to take up leftover space. 'auto' was added as it apparently makes it compatible with IE 10.*/


/**************************************************
The Styles below are just to make the demo pretty. 
**************************************************/
body {
  font-size: 100%;
  line-height: 1.4;
  color: #404040;
}

.container {
  padding: 0 5%;
  margin: 0 auto;
  max-width: 760px;
}

.intro {padding: 1.5rem;}

.hero {
  background: lighten(steelblue, 10%) url('https://source.unsplash.com/E7q00J_8N7A/1600x600/') no-repeat 0 0;
  background-size: cover;
  padding: 2.6em 0;
}

.hero-content {
  background: rgba(5,5,5,0.5);
  border-radius: 6px;
  padding: 1.5em;
    h1 {
    font-size: 2.3rem;
    color: #eee;
  }
    h2 {
      font-size: 1.1rem; 
      margin-bottom: 1.5em;
      color: #bbb;
      font-weight: normal;
  }
}

.features {
  list-style: none;
  color: #eee;
  padding: 0;
  li {
     padding: 0.5rem;
     margin: 0 12px 12px 0;
     display: inline-block;
     border-radius: 4px;
  }
  .all-css {
     background: firebrick;
  }
  .js-free {
    background: steelblue;
  }   
}

header, footer {
  color: darken(steelblue, 10%);
  background-color: darken(steelblue, 50%);
}

@media screen and (min-width: 50rem) {
  body {font-size: 110%;}
  .hero { padding: 4em 0;}
  .hero-content {max-width: 66%;}
 
}
!

JS
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999px

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