Generated by SassMeister.com.

SassMeister-input-HTML.html

<div class="feed">
  <ul class="feed__filters">
    <li class="active">All</li>
    <li>Following</li>
    <li>Groups</li>
  </ul>
  <div class="post">
    <div class="row">
      <img class="post__avatar" src="https://placeholdit.imgix.net/~text?txtsize=6&txt=35%C3%9735&w=35&h=35">
      <div class="post-info">
        <p class="post-info__author">
          <a href="#">Rebecca Zantjer</a> shared with <a href="#">WHQ Toledo</a>
        </p>
        <span class="post-info__timestamp">September 23, 2015 at 3:42pm</span>
      </div>
      
      <div class="post-body">
        <p>How do you make decisions about what links to put where?</p>
        <p>The User Experience research team is hosting a lunch-and-learn today at 12:00 in the cafe. Come learn about digital research tools you can use to help organize content on your site.</p>
      </div>
      
      <div class="post-footer">
        <div class="post-footer__links">
          <a href="#">Like</a>
          <a href="#">Comment</a>
          <a href="#">Share</a>
        </div>
      </div>
    </div>
  </div>
</div>

SassMeister-input.scss

// ----
// libsass (v3.2.5)
// ----

$gray: #999;
$linkBlue: #428BCA;

@mixin clearfix {
  &:after {
    content: "";
    display: table;
    clear: both;
  }
}

body {
  font-family: Helvetica, Arial, sans-serif;
}

a {
  color: $linkBlue;
}

.row {
 @include clearfix; 
}

.feed {
  width: 442px;
}

.feed__filters {
  list-style: none;
  margin-left: 0;
  padding-left: 0;
  text-align: right;
  
  > li {
    display: inline-block;
    margin-left: 10px;
    font-size: 14px;
    cursor: pointer;
    padding: 10px;
    color: $linkBlue;
    border-radius: 5px;
    
    &:first-child {
      margin-left: 0;
    }
    
    &.active {
      background: $linkBlue;
      color: white;
    }
    
    &:hover {
      background: lighten($linkBlue, 20%);
    }
  }
}

.post__avatar {
  float: left;
  margin-right: 10px;
}

.post-info {
  font-size: 10px;
}

.post-info__timestamp {
  color: $gray;
}

.post-body {
  font-size: 12px;
}

.post-footer {
  @extend .row;
}

.post-footer__links {
  font-size: 10px;
  
  > a {
    color: $gray;
    display: inline-block;
    margin-left: 10px;
    
    &:first-child {
      margin-left: 0;
    }
  }
}

SassMeister-output.css

body {
  font-family: Helvetica, Arial, sans-serif;
}

a {
  color: #428BCA;
}

.row:after, .post-footer:after {
  content: "";
  display: table;
  clear: both;
}

.feed {
  width: 442px;
}

.feed__filters {
  list-style: none;
  margin-left: 0;
  padding-left: 0;
  text-align: right;
}

.feed__filters > li {
  display: inline-block;
  margin-left: 10px;
  font-size: 14px;
  cursor: pointer;
  padding: 10px;
  color: #428BCA;
  border-radius: 5px;
}

.feed__filters > li:first-child {
  margin-left: 0;
}

.feed__filters > li.active {
  background: #428BCA;
  color: white;
}

.feed__filters > li:hover {
  background: #92bce0;
}

.post__avatar {
  float: left;
  margin-right: 10px;
}

.post-info {
  font-size: 10px;
}

.post-info__timestamp {
  color: #999;
}

.post-body {
  font-size: 12px;
}

.post-footer__links {
  font-size: 10px;
}

.post-footer__links > a {
  color: #999;
  display: inline-block;
  margin-left: 10px;
}

.post-footer__links > a:first-child {
  margin-left: 0;
}

SassMeister-rendered.html

<div class="feed">
  <ul class="feed__filters">
    <li class="active">All</li>
    <li>Following</li>
    <li>Groups</li>
  </ul>
  <div class="post">
    <div class="row">
      <img class="post__avatar" src="https://placeholdit.imgix.net/~text?txtsize=6&txt=35%C3%9735&w=35&h=35">
      <div class="post-info">
        <p class="post-info__author">
          <a href="#">Rebecca Zantjer</a> shared with <a href="#">WHQ Toledo</a>
        </p>
        <span class="post-info__timestamp">September 23, 2015 at 3:42pm</span>
      </div>
      
      <div class="post-body">
        <p>How do you make decisions about what links to put where?</p>
        <p>The User Experience research team is hosting a lunch-and-learn today at 12:00 in the cafe. Come learn about digital research tools you can use to help organize content on your site.</p>
      </div>
      
      <div class="post-footer">
        <div class="post-footer__links">
          <a href="#">Like</a>
          <a href="#">Comment</a>
          <a href="#">Share</a>
        </div>
      </div>
    </div>
  </div>
</div>