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img.inserted {
  width: 50%;
  float: left;
}
.left .inserted {
  float: left;
  margin: rhythm(0.3) rhythm(0.5) rhythm(0.25) 0;
}

.right .inserted {
  float: right;
  margin: rhythm(0.3) 0 rhythm(0.25) rhythm(0.5);
}

@include at-breakpoint($break-3) {

  img.inserted {
    width: 25%;
  }
}