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SassMeister-input-HTML.html

<div class="region-content">
  <h2>Hello World!
    
  </h2>
  <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-7" class="block">
    Lorem Ipsum Tres <a>Click me</a>
</div>
  
</div>
<footer class="footer" id="footer">Copyright 2015</footer>

SassMeister-input.scss

// ----
// Sass (v3.4.21)
// Compass (v1.0.3)
// ----

// Solve each objective; use Google if you like!
// 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: #eee;
$dark-gray: #ccc;
$red: #c00;

* {
 box-sizing: border-box; 
}
body {
  font-family: helvetica; 
  height: 95vh;
  display: flex;
  flex-flow: column wrap;
  justify-content: space-between;
}
a {
  text-decoration: none;
  color: $red;
}
.region-content {
  flex-grow: 1;
}

.block {
  float: left;
  width: 32%;
  background: $gray;
  padding: 5px;
  margin: 0 1.5% 0 0;
  &:last-child {
    margin-right: 0;
  }
}

h2 {
  @extend small-title !optional;
  font-size: 5em;
  font-weight: bold;
  color: $gray;
}

.footer {
  color: $dark-gray;
  text-align: center;
}

@media screen and (max-width: 700px) {
  h2 {
    font-size: 3em;
  }
  .block {
    float: none;
    width: 100%;
    margin: 0 0 3%;
  }
}

SassMeister-output.css

* {
  box-sizing: border-box;
}

body {
  font-family: helvetica;
  height: 95vh;
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-flex-flow: column wrap;
      -ms-flex-flow: column wrap;
          flex-flow: column wrap;
  -webkit-box-pack: justify;
  -webkit-justify-content: space-between;
      -ms-flex-pack: justify;
          justify-content: space-between;
}

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

.region-content {
  -webkit-box-flex: 1;
  -webkit-flex-grow: 1;
      -ms-flex-positive: 1;
          flex-grow: 1;
}

.block {
  float: left;
  width: 32%;
  background: #eee;
  padding: 5px;
  margin: 0 1.5% 0 0;
}
.block:last-child {
  margin-right: 0;
}

h2 {
  font-size: 5em;
  font-weight: bold;
  color: #eee;
}

.footer {
  color: #ccc;
  text-align: center;
}

@media screen and (max-width: 700px) {
  h2 {
    font-size: 3em;
  }

  .block {
    float: none;
    width: 100%;
    margin: 0 0 3%;
  }
}

SassMeister-rendered.html

<div class="region-content">
  <h2>Hello World!
    
  </h2>
  <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-7" class="block">
    Lorem Ipsum Tres <a>Click me</a>
</div>
  
</div>
<footer class="footer" id="footer">Copyright 2015</footer>