Blame content/assets/css/bootstrap/_button-groups.scss

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//
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// Button groups
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// --------------------------------------------------
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// Button carets
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//
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// Match the button text color to the arrow/caret for indicating dropdown-ness.
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.caret {
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  .btn-default & {
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    border-top-color: $btn-default-color;
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  }
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  .btn-primary &,
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  .btn-success &,
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  .btn-warning &,
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  .btn-danger &,
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  .btn-info & {
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    border-top-color: #fff;
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  }
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}
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.dropup {
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  & .btn-default .caret {
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    border-bottom-color: $btn-default-color;
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  }
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  .btn-primary,
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  .btn-success,
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  .btn-warning,
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  .btn-danger,
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  .btn-info {
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   .caret {
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      border-bottom-color: #fff;
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    }
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  }
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}
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// Make the div behave like a button
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.btn-group,
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.btn-group-vertical {
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  position: relative;
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  display: inline-block;
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  vertical-align: middle; // match .btn alignment given font-size hack above
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  > .btn {
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    position: relative;
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    float: left;
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    // Bring the "active" button to the front
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    &:hover,
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    &:focus,
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    &:active,
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    &.active {
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      z-index: 2;
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    }
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    &:focus {
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      // Remove focus outline when dropdown JS adds it after closing the menu
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      outline: none;
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    }
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  }
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}
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// Prevent double borders when buttons are next to each other
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.btn-group {
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  .btn + .btn,
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  .btn + .btn-group,
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  .btn-group + .btn,
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  .btn-group + .btn-group {
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    margin-left: -1px;
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  }
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}
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// Optional: Group multiple button groups together for a toolbar
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.btn-toolbar {
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  @include clearfix();
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  .btn-group {
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    float: left;
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  }
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  // Space out series of button groups
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  > .btn,
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  > .btn-group {
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    + .btn,
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    + .btn-group {
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      margin-left: 5px;
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    }
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  }
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}
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.btn-group > .btn:not(:first-child):not(:last-child):not(.dropdown-toggle) {
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  border-radius: 0;
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}
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// Set corners individual because sometimes a single button can be in a .btn-group and we need :first-child and :last-child to both match
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.btn-group > .btn:first-child {
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  margin-left: 0;
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  &:not(:last-child):not(.dropdown-toggle) {
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    @include border-right-radius(0);
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  }
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}
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// Need .dropdown-toggle since :last-child doesn't apply given a .dropdown-menu immediately after it
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.btn-group > .btn:last-child:not(:first-child),
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.btn-group > .dropdown-toggle:not(:first-child) {
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  @include border-left-radius(0);
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}
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// Custom edits for including btn-groups within btn-groups (useful for including dropdown buttons within a btn-group)
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.btn-group > .btn-group {
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  float: left;
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}
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.btn-group > .btn-group:not(:first-child):not(:last-child) > .btn {
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  border-radius: 0;
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}
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.btn-group > .btn-group:first-child {
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  > .btn:last-child,
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  > .dropdown-toggle {
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    @include border-right-radius(0);
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  }
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}
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.btn-group > .btn-group:last-child > .btn:first-child {
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  @include border-left-radius(0);
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}
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// On active and open, don't show outline
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.btn-group .dropdown-toggle:active,
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.btn-group.open .dropdown-toggle {
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  outline: 0;
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}
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// Sizing
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//
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// Remix the default button sizing classes into new ones for easier manipulation.
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.btn-group-xs > .btn { @extend .btn-xs; }
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.btn-group-sm > .btn { @extend .btn-sm; }
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.btn-group-lg > .btn { @extend .btn-lg; }
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// Split button dropdowns
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// ----------------------
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// Give the line between buttons some depth
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.btn-group > .btn + .dropdown-toggle {
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  padding-left: 8px;
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  padding-right: 8px;
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}
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.btn-group > .btn-lg + .dropdown-toggle {
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  padding-left: 12px;
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  padding-right: 12px;
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}
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// The clickable button for toggling the menu
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// Remove the gradient and set the same inset shadow as the :active state
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.btn-group.open .dropdown-toggle {
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  @include box-shadow(inset 0 3px 5px rgba(0,0,0,.125));
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}
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// Reposition the caret
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.btn .caret {
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  margin-left: 0;
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}
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// Carets in other button sizes
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.btn-lg .caret {
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  border-width: $caret-width-large $caret-width-large 0;
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  border-bottom-width: 0;
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}
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// Upside down carets for .dropup
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.dropup .btn-lg .caret {
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  border-width: 0 $caret-width-large $caret-width-large;
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}
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// Vertical button groups
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// ----------------------
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.btn-group-vertical {
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  > .btn,
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  > .btn-group {
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    display: block;
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    float: none;
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    width: 100%;
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    max-width: 100%;
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  }
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  // Clear floats so dropdown menus can be properly placed
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  > .btn-group {
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    @include clearfix();
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    > .btn {
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      float: none;
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    }
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  }
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  > .btn + .btn,
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  > .btn + .btn-group,
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  > .btn-group + .btn,
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  > .btn-group + .btn-group {
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    margin-top: -1px;
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    margin-left: 0;
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  }
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}
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.btn-group-vertical > .btn {
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  &:not(:first-child):not(:last-child) {
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    border-radius: 0;
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  }
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  &:first-child:not(:last-child) {
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    border-top-right-radius: $border-radius-base;
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    @include border-bottom-radius(0);
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  }
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  &:last-child:not(:first-child) {
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    border-bottom-left-radius: $border-radius-base;
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    @include border-top-radius(0);
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  }
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}
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.btn-group-vertical > .btn-group:not(:first-child):not(:last-child) > .btn {
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  border-radius: 0;
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}
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.btn-group-vertical > .btn-group:first-child {
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  > .btn:last-child,
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  > .dropdown-toggle {
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    @include border-bottom-radius(0);
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  }
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}
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.btn-group-vertical > .btn-group:last-child > .btn:first-child {
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  @include border-top-radius(0);
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}
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// Justified button groups
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// ----------------------
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.btn-group-justified {
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  display: table;
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  width: 100%;
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  table-layout: fixed;
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  border-collapse: separate;
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  .btn {
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    float: none;
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    display: table-cell;
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    width: 1%;
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  }
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}
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// Checkbox and radio options
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[data-toggle="buttons"] > .btn > input[type="radio"],
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[data-toggle="buttons"] > .btn > input[type="checkbox"] {
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  display: none;
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}