Generated by SassMeister.com.

SassMeister-input.scss

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

$margin-base: 15;
$scale: 3;

@for $i from 1 through 3 {
  $margin: $margin-base/$i;
  .m-#{$i} {
    margin: $margin;
  }
  .mt-#{$i} {
    margin-top: $margin;
  }
  .mr-#{$i} {
    margin-right: $margin;
  }
  .mb-#{$i} {
    margin-bottom: $margin;
  }
  .ml-#{$i} {
    margin-left: $margin;
  }
}

SassMeister-output.css

.m-1 {
  margin: 15;
}

.mt-1 {
  margin-top: 15;
}

.mr-1 {
  margin-right: 15;
}

.mb-1 {
  margin-bottom: 15;
}

.ml-1 {
  margin-left: 15;
}

.m-2 {
  margin: 7.5;
}

.mt-2 {
  margin-top: 7.5;
}

.mr-2 {
  margin-right: 7.5;
}

.mb-2 {
  margin-bottom: 7.5;
}

.ml-2 {
  margin-left: 7.5;
}

.m-3 {
  margin: 5;
}

.mt-3 {
  margin-top: 5;
}

.mr-3 {
  margin-right: 5;
}

.mb-3 {
  margin-bottom: 5;
}

.ml-3 {
  margin-left: 5;
}