Generated by SassMeister.com.

SassMeister-input.scss

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

//Width
@each $index, $width in (1: 15%, 2: 30%, 4: 45%) {
  .collage-width-#{$index} {
    width: $width;
    overflow: hidden;
  }
}
// Height
@each $index, $height in (1: 90px, 2: 190px) {
  .collage-height-#{$index} {
    height: $height;
    overflow: hidden;
  }
}

SassMeister-output.css

.collage-width-1 {
  width: 15%;
  overflow: hidden;
}

.collage-width-2 {
  width: 30%;
  overflow: hidden;
}

.collage-width-4 {
  width: 45%;
  overflow: hidden;
}

.collage-height-1 {
  height: 90px;
  overflow: hidden;
}

.collage-height-2 {
  height: 190px;
  overflow: hidden;
}