CodePen

HTML

            
              <div class="header-wrap"> 
  <header class="cf">
    <div class="logo">
      <img  src="http://placehold.it/350x150" alt="">
    </div>
    <nav>
      NAVIGATION GOES HERE
    </nav>  
  </header>
</div> 
<div class="wrap">  
  <div class="main cf">
    <div class="content">
<p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>      
    </div>
    <aside>
<p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>  
    </aside>
  </div>
  
  <footer>
    
  </footer>
            
          
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CSS

            
              * {
  box-sizing: border-box;
}

.cf:before,
.cf:after {
  content: "";
  display: table;
} 
.cf:after {
  clear: both;
}
.cf {
  zoom: 1; /* For IE 6/7 (trigger hasLayout) */
}

html, body, div.wrap { 
  height: 100%;
}

body {
  background:pink;
}

body > div.wrap {
  
}

.wrap, .header-wrap {
  width:90%;
  margin:0 auto;
  background:white;
}

header {
  background:#bada55;
  padding:10px;
}

.logo, nav {
  float:left;
}

.logo {
  width:22%;
}

nav {
  width:78%;
  background:darkblue;
  height:50px;
  color:white;
  text-align:center;
  line-height:50px;
}


.main { 
  padding-bottom: 75px; /* must be same height as the footer */
}

.main {
  height:100%;
  background:cream;
  
}

.content {
  width:75%;
  background:white;
  height:100%;
  border-right:1px dashed blue;
  float:left;
  padding:10px;
}

aside {
  float:left;
  width:25%;
  padding:10px;
}

footer { 
  position: relative;
  margin-top: -75px; /* negative value of footer height */
  height: 75px;
  background:lightblue;
  border-top:1px dashed darkblue;
}
            
          
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JS

            
              
            
          
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