<commit_before>.collage {
  background: @color-empty;
  clear: both;
  height: 50%;
  min-height: 600px;
  position: relative;

  &:after {
    background: @color-empty;
    clear: both;
    content: '';
    display: table;
    height: 100%;
    width: 100%;
    top: -100%;
    position: relative;
    z-index: -1;
  }

  &.responsive {
    @media only screen and (max-width: @breakpoint) {
      height: 25%;
      min-height: 300px;
    }
  }

  &.short { // band-like collage, single row
    height: 25%;
    min-height: 300px;
  }

  &.medium { // band-like collage, single row
    height: 42%;
    min-height: 450px;
  }<commit_msg>Case Study: fine tune collage.responsive<commit_after>.collage {
  background: @color-empty;
  clear: both;
  height: 50%;
  min-height: 600px;
  position: relative;

  &:after {
    background: @color-empty;
    clear: both;
    content: '';
    display: table;
    height: 100%;
    width: 100%;
    top: -100%;
    position: relative;
    z-index: -1;
  }

  &.responsive {
    @media only screen and (max-width: @breakpoint) {
      height: 25%;
      min-height: 280px;
    }
  }

  &.short { // band-like collage, single row
    height: 25%;
    min-height: 300px;
  }

  &.medium { // band-like collage, single row
    height: 42%;
    min-height: 450px;
  }
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