twbs--bootstrap/scss/_card.scss

//
// Base styles
//

$card-spacer-x:            1.25rem;
$card-spacer-y:            .75rem;
$card-border-width:        .0625rem;
$card-border-radius:       .25rem;
$card-border-color:        #e5e5e5;
$card-border-radius-inner: ($card-border-radius - $card-border-width);

$card-cap-bg: #f5f5f5;

.card {
  position: relative;
  margin-bottom: $card-spacer-y;
  border: $card-border-width solid $card-border-color;
  @include border-radius($card-border-radius);
}

.card-block {
  padding: $card-spacer-x;
}

.card-title {
  margin-top: 0;
  margin-bottom: $card-spacer-y;
}

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

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

// .card-actions {
//   padding: $card-spacer-y $card-spacer-x;

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

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

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

@if $enable-rounded {
  .card {
    > .list-group:first-child {
      .list-group-item:first-child {
        border-radius: $card-border-radius $card-border-radius 0 0;
      }
    }

    > .list-group:last-child {
      .list-group-item:last-child {
        border-radius: 0 0 $card-border-radius $card-border-radius;
      }
    }
  }
}


//
// Optional textual caps
//

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

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


//
// Background variations
//

.card-primary {
  background-color: $brand-primary;
  border-color: $brand-primary;
}
.card-success {
  background-color: $brand-success;
  border-color: $brand-success;
}
.card-info {
  background-color: $brand-info;
  border-color: $brand-info;
}
.card-warning {
  background-color: $brand-warning;
  border-color: $brand-warning;
}
.card-danger {
  background-color: $brand-danger;
  border-color: $brand-danger;
}


//
// Inverse text within a card for use with dark backgrounds
//

.card-inverse {
  .card-header,
  .card-footer {
    border-bottom: .075rem solid rgba(255,255,255,.2);
  }
  .card-header,
  .card-footer,
  .card-title,
  .card-blockquote {
    color: #fff;
  }
  .card-link,
  .card-text,
  .card-blockquote > footer {
    color: rgba(255,255,255,.65);
  }
  .card-link {
    @include hover-focus {
      color: #fff;
    }
  }
}


//
// Blockquote
//

.card-blockquote {
  padding: 0;
  margin-bottom: 0;
  border-left: 0;
}

// Card image
.card-img {
  // margin: -1.325rem;
  @include border-radius(.25rem);
}
.card-img-overlay {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  padding: 1.25rem;
}



// Card image caps
.card-img-top {
  @include border-radius(.25rem .25rem 0 0);
}
.card-img-bottom {
  @include border-radius(0 0 .25rem .25rem);
}


//
// Card set
//

@if $enable-flex {
  .card-deck {
    display: flex;
    flex-flow: row wrap;
    margin-right: -.625rem;
    margin-left: -.625rem;

    .card {
      flex: 1 0 0;
      margin-right: .625rem;
      margin-left: .625rem;
    }
  }
} @else {
  .card-deck {
    display: table;
    table-layout: fixed;
    border-spacing: 1.25rem 0;

    .card {
      display: table-cell;
      width: 1%;
      vertical-align: top;
    }
  }
  .card-deck-wrapper {
    margin-right: -1.25rem;
    margin-left: -1.25rem;
  }
}

//
// Card groups
//

.card-group {
  @if $enable-flex {
    display: flex;
    flex-flow: row wrap;
  } @else {
    display: table;
    width: 100%;
    table-layout: fixed;
  }

  .card {
    @if $enable-flex {
      flex: 1 0 0;
    } @else {
      display: table-cell;
      vertical-align: top;
    }

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

    // Handle rounded corners
    @if $enable-rounded {
      &:first-child {
        .card-img-top {
          border-top-right-radius: 0;
        }
        .card-img-bottom {
          border-bottom-right-radius: 0;
        }
      }
      &:last-child {
        .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;
        }
      }
    }
  }
}


//
// Card
//

.card-columns {
  column-count: 3;
  column-gap: 1.25rem;

  .card {
    display: inline-block;
    width: 100%; // Don't let them exceed the column width
  }
}