assets/sass/@primer/css/utilities/margin.scss


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// Margin spacer utilities
// stylelint-disable block-opening-brace-space-before, declaration-colon-space-before, comment-empty-line-before

// Loop through the breakpoint values
@each $breakpoint, $variant in $responsive-variants {
  @include breakpoint($breakpoint) {
    // Loop through the spacer values
    @each $scale, $size in $spacer-map {
      /* Set a $size margin to all sides at $breakpoint */
      .m#{$variant}-#{$scale}  { margin: $size !important; }
      /* Set a $size margin on the top at $breakpoint */
      .mt#{$variant}-#{$scale} { margin-top: $size !important; }
      /* Set a $size margin on the right at $breakpoint */
      .mr#{$variant}-#{$scale} { margin-right: $size !important; }
      /* Set a $size margin on the bottom at $breakpoint */
      .mb#{$variant}-#{$scale} { margin-bottom: $size !important; }
      /* Set a $size margin on the left at $breakpoint */
      .ml#{$variant}-#{$scale} { margin-left: $size !important; }

      @if ($size != 0) {
        /* Set a negative $size margin on top at $breakpoint */
        .mt#{$variant}-n#{$scale} { margin-top   : -$size !important; }
        /* Set a negative $size margin on the right at $breakpoint */
        .mr#{$variant}-n#{$scale} { margin-right : -$size !important; }
        /* Set a negative $size margin on the bottom at $breakpoint */
        .mb#{$variant}-n#{$scale} { margin-bottom: -$size !important; }
        /* Set a negative $size margin on the left at $breakpoint */
        .ml#{$variant}-n#{$scale} { margin-left  : -$size !important; }
      }

      /* Set a $size margin on the left & right at $breakpoint */
      .mx#{$variant}-#{$scale} {
        margin-right: $size !important;
        margin-left: $size !important;
      }

      /* Set a $size margin on the top & bottom at $breakpoint */
      .my#{$variant}-#{$scale} {
        margin-top: $size !important;
        margin-bottom: $size !important;
      }
    }

    /* responsive horizontal auto margins */
    .mx#{$variant}-auto {
      margin-right: auto !important;
      margin-left: auto !important;
    }
  }
}