Generated by SassMeister.com.

SassMeister-input-HTML.html

<div class="region-content">
  <h1>Hello World!</h1>
  <div id="block-block-1" class="block">
    Lorem Ipsum Uno <a href="http://www.redhat.com">Click me</a>
  </div>
  <div id="block-block-5" class="block">
    Lorem Ipsum Dos <a href="http://www.redhat.com">Click me</a>
  </div>
  <div id="block-block-5" class="block">
    Lorem Ipsum Tres <a href="http://www.redhat.com">Click me</a>
  </div>
  
</div>

SassMeister-input.scss

// ----
// Sass (v3.4.12)
// Compass (v1.0.3)
// ----

* {
 box-sizing: border-box; 
}
body {
  font-family: helvetica; 
}
a {
  text-decoration: none;
  color: #c00;
}
.block {
  float: left;
  width: 30%;
  background: #eee;
  padding: 5px;
  margin: 1.5%;
}

// Objective #1 Resolve syntax issues so that this code compiles to CSS.
// Objective #2 Fix any potential problems this CSS could cause on redhat.com. 
// Objective #3 Make the code DRY! 
// Bonus, fix the HTML error
$gray: #ccc;

@mixin small-title {
  font-size: 5em;
  font-weight: bold;
  color: $gray;
}

@media screen and (max-width: 900px) {
  .region-content {
    width: 100%;
    background: url(/images/red-bg.png) no-repeat 0 0;
    .block {
      background: $gray;
    }
  }
}
 
.region-content h1 {
  @include small-title;
}

SassMeister-output.css

* {
  box-sizing: border-box;
}

body {
  font-family: helvetica;
}

a {
  text-decoration: none;
  color: #c00;
}

.block {
  float: left;
  width: 30%;
  background: #eee;
  padding: 5px;
  margin: 1.5%;
}

@media screen and (max-width: 900px) {
  .region-content {
    width: 100%;
    background: url(/images/red-bg.png) no-repeat 0 0;
  }
  .region-content .block {
    background: #ccc;
  }
}
.region-content h1 {
  font-size: 5em;
  font-weight: bold;
  color: #ccc;
}

SassMeister-rendered.html

<div class="region-content">
  <h1>Hello World!</h1>
  <div id="block-block-1" class="block">
    Lorem Ipsum Uno <a href="http://www.redhat.com">Click me</a>
  </div>
  <div id="block-block-5" class="block">
    Lorem Ipsum Dos <a href="http://www.redhat.com">Click me</a>
  </div>
  <div id="block-block-5" class="block">
    Lorem Ipsum Tres <a href="http://www.redhat.com">Click me</a>
  </div>
  
</div>