Generated by SassMeister.com.

SassMeister-input-HTML.html

<div class="container">
  <div class="testing">testing</div>
</div>

SassMeister-input.scss

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

@import "susy";

$susy:(debug:(image:true));

.container {@include container(show)};

.testing {
  @include susy-breakpoint(800px, split) {
    @include span(2);
  }
}

SassMeister-output.css

.container {
  max-width: 100%;
  margin-left: auto;
  margin-right: auto;
  background-image: linear-gradient(to right, rgba(102, 102, 255, 0.25), rgba(179, 179, 255, 0.25) 80%, transparent 80%);
  background-size: 26.31579%;
  background-origin: content-box;
  background-clip: content-box;
  background-position: left top;
}

.container:after {
  content: " ";
  display: block;
  clear: both;
}

@media (min-width: 800px) {
  .testing {
    width: 45%;
    float: left;
    margin-left: 2.5%;
    margin-right: 2.5%;
  }
}

SassMeister-rendered.html

<div class="container">
  <div class="testing">testing</div>
</div>