Generated by SassMeister.com.

SassMeister-input-HTML.html

<div class='viewport'>
    <ul>
        <li><a href="#">Need Help?</a></li>
        <li><a href="#">Volunteer</a></li>
        <li><a href="#">Donate</a></li>
    </ul>
</div>

SassMeister-input.scss

// ----
// Sass (v3.3.0.rc.1)
// Compass (v0.13.alpha.10)
// ----

@import "bourbon/bourbon";

body {
    background: #ddd;
    
}
.viewport {
    width: 100%;
    max-width: 96rem;
}
ul {
    list-style: none;
    margin: 0;
    padding: 0;
}
li {
    display: inline-block;
    width: 32.5%; // sassmeister has some fuzzyness on the preview
    text-align: center;
}
a {
    border-radius: 50%;
    display: block;
    background: #E86EA4;
    text-decoration: none;
    color: #fff;
    height: 33vw;
    line-height: 33vw;
}

SassMeister-output.css

body {
  background: #ddd;
}

.viewport {
  width: 100%;
  max-width: 96rem;
}

ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

li {
  display: inline-block;
  width: 32.5%;
  text-align: center;
}

a {
  border-radius: 50%;
  display: block;
  background: #E86EA4;
  text-decoration: none;
  color: #fff;
  height: 33vw;
  line-height: 33vw;
}

SassMeister-rendered.html

<div class='viewport'>
    <ul>
        <li><a href="#">Need Help?</a></li>
        <li><a href="#">Volunteer</a></li>
        <li><a href="#">Donate</a></li>
    </ul>
</div>