Generated by SassMeister.com.

SassMeister-input-HTML.html

<nav id="side" class="collapse">
  <header>
    <img id="sideNavTogle" src="http://www.airpair.com/v1/img/css/sidenav/toggle.png">
  </header>
  <section class="wellcome">
    <figure>
      <a id="navWellcomeAvatar">
        <img class="avatar" src="http://www.airpair.com/v1/img/css/sidenav/default-mario.png"/>
      </a>
    </figure>
    <a id="navAbout" class="icon">
      <img src="http://www.airpair.com/v1/img/css/sidenav/airpair.png"/>
    </a>
  </section>
  <section class="stack">
    <a id="navStackToggle"class="icon">
      <img src="http://www.airpair.com/v1/img/css/sidenav/stack.png">
      <i>0</i>
    </a>
  </section>
</nav>

SassMeister-input.scss

// ----
// Sass (v3.4.7)
// Compass (v1.0.1)
// ----

nav#side.collapse {
  top:0px;
  width:40px;
}
nav#side {
  background:#151821;
  display:block;
  bottom:0;
  left:0;
  height:auto;
  position:fixed;
  
  #navAbout {
    margin-top:30px;
  }
  #navStackToggle {
    margin-top:30px;
  }
  
  a.icon {
    text-align:center;
    display:block;
    
    i{
      position:relative;
      top:-32px;
      background:#ce5424;
    }
  }
  
  section {
    margin-top:5px;
  }
  
  figure {
    text-align:center;
  }
  
  header {
    padding:5px 8px;
    border-bottom:1px solid #4d4e4e;
  }
}
.avatar {
  height:28px;
  width:28px;
  background:#ce5424;
  border-radius:50px;
  margin-top:10px;
}
figure {
  margin:0;
}

SassMeister-output.css

nav#side.collapse {
  top: 0px;
  width: 40px;
}

nav#side {
  background: #151821;
  display: block;
  bottom: 0;
  left: 0;
  height: auto;
  position: fixed;
}
nav#side #navAbout {
  margin-top: 30px;
}
nav#side #navStackToggle {
  margin-top: 30px;
}
nav#side a.icon {
  text-align: center;
  display: block;
}
nav#side a.icon i {
  position: relative;
  top: -32px;
  background: #ce5424;
}
nav#side section {
  margin-top: 5px;
}
nav#side figure {
  text-align: center;
}
nav#side header {
  padding: 5px 8px;
  border-bottom: 1px solid #4d4e4e;
}

.avatar {
  height: 28px;
  width: 28px;
  background: #ce5424;
  border-radius: 50px;
  margin-top: 10px;
}

figure {
  margin: 0;
}

SassMeister-rendered.html

<nav id="side" class="collapse">
  <header>
    <img id="sideNavTogle" src="http://www.airpair.com/v1/img/css/sidenav/toggle.png">
  </header>
  <section class="wellcome">
    <figure>
      <a id="navWellcomeAvatar">
        <img class="avatar" src="http://www.airpair.com/v1/img/css/sidenav/default-mario.png"/>
      </a>
    </figure>
    <a id="navAbout" class="icon">
      <img src="http://www.airpair.com/v1/img/css/sidenav/airpair.png"/>
    </a>
  </section>
  <section class="stack">
    <a id="navStackToggle"class="icon">
      <img src="http://www.airpair.com/v1/img/css/sidenav/stack.png">
      <i>0</i>
    </a>
  </section>
</nav>