MyMongodb/node_modules/bootstrap/scss/_button-group.scss

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// stylelint-disable selector-no-qualifying-type

// Make the div behave like a button
.btn-group,
.btn-group-vertical {
  position: relative;
  display: inline-flex;
  vertical-align: middle; // match .btn alignment given font-size hack above

  > .btn {
    position: relative;
    flex: 1 1 auto;

    // Bring the hover, focused, and "active" buttons to the front to overlay
    // the borders properly
    @include hover() {
      z-index: 1;
    }
    &:focus,
    &:active,
    &.active {
      z-index: 1;
    }
  }
}

// Optional: Group multiple button groups together for a toolbar
.btn-toolbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;

  .input-group {
    width: auto;
  }
}

.btn-group {
  // Prevent double borders when buttons are next to each other
  > .btn:not(:first-child),
  > .btn-group:not(:first-child) {
    margin-left: -$btn-border-width;
  }

  // Reset rounded corners
  > .btn:not(:last-child):not(.dropdown-toggle),
  > .btn-group:not(:last-child) > .btn {
    @include border-right-radius(0);
  }

  > .btn:not(:first-child),
  > .btn-group:not(:first-child) > .btn {
    @include border-left-radius(0);
  }
}

// Sizing
//
// Remix the default button sizing classes into new ones for easier manipulation.