card columns behavior for bulma

bs4-border-radius-mixin.scss

// Single side border-radius

@mixin border-radius($radius: $border-radius) {
  @if $enable-rounded {
    border-radius: $radius;
  }
}

@mixin border-top-radius($radius) {
  @if $enable-rounded {
    border-top-left-radius: $radius;
    border-top-right-radius: $radius;
  }
}

@mixin border-right-radius($radius) {
  @if $enable-rounded {
    border-top-right-radius: $radius;
    border-bottom-right-radius: $radius;
  }
}

@mixin border-bottom-radius($radius) {
  @if $enable-rounded {
    border-bottom-right-radius: $radius;
    border-bottom-left-radius: $radius;
  }
}

@mixin border-left-radius($radius) {
  @if $enable-rounded {
    border-top-left-radius: $radius;
    border-bottom-left-radius: $radius;
  }
}

bs4-cards.scss

//
// Base styles
//
@import "./bs4-border-radius-mixin.scss";
@import "./bs4-hover-mixin.scss";

$gray-200: #e9ecef !default;
$border-width: 1px !default;
$border-color: $gray-200 !default;

$border-radius:          .25rem !default;
$border-radius-lg:       .3rem !default;
$border-radius-sm:       .2rem !default;
$grid-gutter-width: 30px !default;

// Cards

$card-spacer-y:            .75rem !default;
$card-spacer-x:            1.25rem !default;
$card-border-width:        $border-width !default;
$card-border-radius:       $border-radius !default;
$card-border-color:        rgba($black,.125) !default;
$card-inner-border-radius: calc(#{$card-border-radius} - #{$card-border-width}) !default;
$card-cap-bg:              rgba($black, .03) !default;
$card-bg:                  $white !default;

$card-img-overlay-padding: 1.25rem !default;

$card-group-margin:         ($grid-gutter-width / 2) !default;
$card-deck-margin:          $card-group-margin !default;

$card-columns-count:        3 !default;
$card-columns-gap:          1.25rem !default;
$card-columns-margin:       $card-spacer-y !default;


.card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
  word-wrap: break-word;
  background-color: $card-bg;
  background-clip: border-box;
  border: $card-border-width solid $card-border-color;
  @include border-radius($card-border-radius);
}

.card-body {
  // Enable `flex-grow: 1` for decks and groups so that card blocks take up
  // as much space as possible, ensuring footers are aligned to the bottom.
  flex: 1 1 auto;
  padding: $card-spacer-x;
}

.card-title {
  margin-bottom: $card-spacer-y;
}

.card-subtitle {
  margin-top: -($card-spacer-y / 2);
  margin-bottom: 0;
}

.card-text:last-child {
  margin-bottom: 0;
}

.card-link {
  @include hover {
    text-decoration: none;
  }

  + .card-link {
    margin-left: $card-spacer-x;
  }
}

.card {
  > .list-group:first-child {
    .list-group-item:first-child {
      @include border-top-radius($card-border-radius);
    }
  }

  > .list-group:last-child {
    .list-group-item:last-child {
      @include border-bottom-radius($card-border-radius);
    }
  }

  .card-header + .list-group > .list-group-item:first-child {
    border-top: 0;
  }
}


//
// Optional textual caps
//

.card-header {
  padding: $card-spacer-y $card-spacer-x;
  margin-bottom: 0; // Removes the default margin-bottom of <hN>
  background-color: $card-cap-bg;
  border-bottom: $card-border-width solid $card-border-color;

  &:first-child {
    @include border-radius($card-inner-border-radius $card-inner-border-radius 0 0);
  }
}

.card-footer {
  padding: $card-spacer-y $card-spacer-x;
  background-color: $card-cap-bg;
  border-top: $card-border-width solid $card-border-color;

  &:last-child {
    @include border-radius(0 0 $card-inner-border-radius $card-inner-border-radius);
  }
}


//
// Header navs
//

.card-header-tabs {
  margin-right: -($card-spacer-x / 2);
  margin-bottom: -$card-spacer-y;
  margin-left: -($card-spacer-x / 2);
  border-bottom: 0;
}

.card-header-pills {
  margin-right: -($card-spacer-x / 2);
  margin-left: -($card-spacer-x / 2);
}

// Card image
.card-img-overlay {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  padding: $card-img-overlay-padding;
}

.card-img {
  width: 100%; // Required because we use flexbox and this inherently applies align-self: stretch
  @include border-radius($card-inner-border-radius);
}

// Card image caps
.card-img-top {
  width: 100%; // Required because we use flexbox and this inherently applies align-self: stretch
  @include border-top-radius($card-inner-border-radius);
}

.card-img-bottom {
  width: 100%; // Required because we use flexbox and this inherently applies align-self: stretch
  @include border-bottom-radius($card-inner-border-radius);
}


// Card deck

.card-deck {
  display: flex;
  flex-direction: column;

  .card {
    margin-bottom: $card-deck-margin;
  }

  @include desktop {
    flex-flow: row wrap;
    margin-right: -$card-deck-margin;
    margin-left: -$card-deck-margin;

    .card {
      display: flex;
      flex: 1 0 0%;
      flex-direction: column;
      margin-right: $card-deck-margin;
      margin-bottom: 0; // Override the default
      margin-left: $card-deck-margin;
    }
  }
}


//
// Card groups
//

.card-group {
  display: flex;
  flex-direction: column;

  .card {
    margin-bottom: $card-group-margin;
  }

  @include mobile {
    flex-flow: row wrap;

    .card {
      flex: 1 0 0%;
      margin-bottom: 0;

      + .card {
        margin-left: 0;
        border-left: 0;
      }

      // Handle rounded corners
      @if $enable-rounded {
        &:first-child {
          @include border-right-radius(0);

          .card-img-top {
            border-top-right-radius: 0;
          }
          .card-img-bottom {
            border-bottom-right-radius: 0;
          }
        }

        &:last-child {
          @include border-left-radius(0);

          .card-img-top {
            border-top-left-radius: 0;
          }
          .card-img-bottom {
            border-bottom-left-radius: 0;
          }
        }

        &:not(:first-child):not(:last-child) {
          border-radius: 0;

          .card-img-top,
          .card-img-bottom {
            border-radius: 0;
          }
        }
      }
    }
  }
}


//
// Columns
//

.card-columns {
  .card {
    margin-bottom: $card-columns-margin;
  }

  @include desktop {
    column-count: $card-columns-count;
    column-gap: $card-columns-gap;

    .card {
      display: inline-block; // Don't let them vertically span multiple columns
      width: 100%; // Don't let their width change
    }
  }
}

bs4-hover-mixin.scss

@mixin hover {
  // TODO: re-enable along with mq4-hover-shim
//  @if $enable-hover-media-query {
//    // See Media Queries Level 4: https://drafts.csswg.org/mediaqueries/#hover
//    // Currently shimmed by https://github.com/twbs/mq4-hover-shim
//    @media (hover: hover) {
//      &:hover { @content }
//    }
//  }
//  @else {
// scss-lint:disable Indentation
    &:hover { @content }
// scss-lint:enable Indentation
//  }
}


@mixin hover-focus {
  @if $enable-hover-media-query {
    &:focus { @content }
    @include hover { @content }
  } @else {
    &:focus,
    &:hover {
      @content
    }
  }
}

@mixin plain-hover-focus {
  @if $enable-hover-media-query {
    &,
    &:focus {
      @content
    }
    @include hover { @content }
  } @else {
    &,
    &:focus,
    &:hover {
      @content
    }
  }
}

@mixin hover-focus-active {
  @if $enable-hover-media-query {
    &:focus,
    &:active {
      @content
    }
    @include hover { @content }
  } @else {
    &:focus,
    &:active,
    &:hover {
      @content
    }
  }
}