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@row-height: 72px;

.margin-vertical-center(@height, @context-height) {
  @margin: ((@context-height * .5) - (@height * .5));
  margin-bottom: @margin;
  margin-top: @margin;
}

.module {
  .margin-vertical-center(36px, @row-height);
}

.module {
  .margin-vertical-center(96px, @row-height);
}

.module {
  .margin-vertical-center(24px, @row-height);
}

.module {
  margin-bottom: 18px;
  margin-top: 18px;
}
.module {
  margin-bottom: -12px;
  margin-top: -12px;
}
.module {
  margin-bottom: 24px;
  margin-top: 24px;
}