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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              <link href='https://fonts.googleapis.com/css?family=Share+Tech&subset=latin,latin-ext' rel='stylesheet' type='text/css'>
<body data-spy="scroll" data-target="#side-nav">
<div class="container">
  <div class="row">
    <div id="side-nav">
      <ul class="nav nav-list affix">
        <li><a href="#start">*Scroll Spy<br><sub>vertical height</sub></a></li>
        <li><a href="#one">N&deg;1</a></li>
        <li><a href="#two">N&deg;2</a></li>
        <li><a href="#three">N&deg;3</a></li>
      </ul>
    </div>
    <div class="col-md-offset-3 col-md-9 content">
      <div id="start" class="h1-wrap">
      <h1 class="shareTech opacity">Scroll Spy Vertical Height Demo</h1>
        <div class="puppyWrap"><div class="puppyCover opacity"></div>
       <img class="topImage" src="http://www.drawing-factory.com/image-files/how-to-draw-a-puppy-labrador11.jpg" />
        </div>
      </div>
      <section id="one">
        <h2 class="shareTech">Section 1</h2>
             <p>
               Scroll spy is very fun but pretty tricky when it's activated by id's with elements of varying heights.
             </p>
      </section>
      <section id="two">
        <h2 class="shareTech">Section 2</h2>
         <p>
           <strong>Note:</strong> If the nav list is of a certain height and is the trigger element well - you could run into problems when consider spy activation.
             </p>
      </section>
      <section id="three">
        <h2 class="shareTech">Section 3</h2>
         <p>
               If you're rendering trigger id elements dynamically it's best to make sure that you're setting the height of the element as well; particularly if the element height is small. 
             </p>
      </section>
      <sub>Disclaimer: this is mainly an issue for desktop viewing so this example will not depercate nicely. You're welcome. ;) The background image is from <a href="http://www.drawing-factory.com/">The Drawing Factory</a>.</sub>
    </div>
  </div>
</div>
</body>
            
          
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              body, body a {
  background:#FAF7FA;
  color: #A76AD9;
}

body .nav-list>.active>a{
  background-color:#DDBFF5;
}
body .nav-list>.active>a:hover {
  background:#A146C2;
}
body .nav a:hover{
  color:#DDBFF5;
  background-color: #F7EDFA;
}
#side-nav {
  position: relative;
  overflow: hidden;
}
#side-nav:before,
#side-nav:after {
  content: ' ';
  display: table;
}
#side-nav:after {
  clear: both;
}

.shareTech {
  font-family: 'Share Tech', sans-serif;
}
.nav-list li a {
  height:80px;
  font-size:2em;
  line-height:80px;
}
.opacity, section {
  opacity:.7;
}
.h1-wrap {
    padding:1em 1em 5em 2em;
    background-color: #F7EDFA;
    margin-bottom:1em;
}
h1:first-of-type {
  color:#A146C2;
  font-size:3em;
  margin-top:1em;
  margin-left:25%;
}
.topImage {
  display:inline-block;
  height:auto;
  width:40%;
  margin-left:30%;
}
.puppyCover {
  background-color: #F5E8FA;
  position:relative;
  width:40%;
  height:332px;
  margin-bottom:-332px;
  margin-left:30%;
}
section {
  background-color: #F2EBF7;
  height:300px;
  margin-bottom:1em;
  padding: 1em 1em .5em 1em;
}
section + section {
  height:220px /* note the section height here! */
}

section + section + section {
  height:400px
}
section h2 {
  font-size:2em;
  line-height:2.5em;
}
section h2:first-letter {
  font-size:3em;
}
section p {
  float:right;
  font-size:1.5em;
  line-height:1.6em;
  width:50%;
}
sub {
  background:#A76AD9;
  color:#fff;
  padding:1em;
  display:block;
  float:right;
  font-size:1em;
  line-height:1.1em;
  margin-bottom:2em;
  margin-right:1em;
  width:50%;
}
sub a {
  background:none;
  color:#fff;
}
sub a:hover {
  color:#fff;
  text-decoration:underline;
}
@media only screen and (max-width: 1200px) { 
  #side-nav, .puppyWrap {display:none;}
  .col-md-offset-3 {
    margin-left: 0;
  }
  .col-md-9 {
    width: 100%;
  }
}
            
          
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