File: web/bundles/extjs/resources/theme-bootstrap/theme/stylesheets/bootstrap/default/widgets/_btn-group.scss

/**
 * Creates the base structure of a button group.
 * @member Ext.container.ButtonGroup
 */
@mixin extjs-btn-group {
    .#{$prefix}btn-group {
        position: relative;
        overflow: hidden;
    }

    .#{$prefix}btn-group-body {
        position: relative;
        zoom: 1;
        padding: $btn-group-padding;
        .#{$prefix}table-layout-cell {
            vertical-align: top;
        }
    }

    .#{$prefix}btn-group-header-text {
        white-space: nowrap;
    }

    @include extjs-btn-group-ui('default');
}

/**
 * Creates a visual theme of a button group.
 * @member Ext.container.ButtonGroup
 */
@mixin extjs-btn-group-ui(
    $ui-label,
    $ui-base-color: null,

    // background
    $ui-background-color: $btn-group-background-color,

    // borders
    $ui-border-color: $btn-group-border-color,
    $ui-border-width: $btn-group-border-width,
    $ui-border-radius: $btn-group-border-radius,
    $ui-inner-border-color: $btn-group-inner-border-color,

    //header
    $ui-header-background-color: $btn-group-header-background-color,
    $ui-header-font: $btn-group-header-font,
    $ui-header-color: $btn-group-header-color
){
    @include x-frame(
        'btn-group',
        $ui: '#{$ui-label}-framed',

        /* Radius, width, padding and background-color */
        $border-radius: $ui-border-radius,
        $border-width: $ui-border-width,
        $padding: $btn-group-padding,
        $background-color: $ui-background-color
    );

    .#{$prefix}btn-group-#{$ui-label}-framed {
        border-color: $ui-border-color;
        @include inner-border(
            $width: $btn-group-inner-border-width,
            $color: $ui-inner-border-color
        );
    }

    .#{$prefix}btn-group-header-#{$ui-label}-framed {
        margin: $btn-group-header-margin;
    }

    .#{$prefix}btn-group-header-body-#{$ui-label}-framed {
        padding: $btn-group-header-padding;

        background: $ui-header-background-color;

        @include border-top-radius($ui-border-radius);
    }

    .#{$prefix}btn-group-header-text-#{$ui-label}-framed {
        font: $ui-header-font;
        color: $ui-header-color;
    }
}