    /**
     * @class Ext.grid.column.CheckColumn
     */

    /**
     * @var {number}
     * Opacity of disabled CheckColumns
     */
    $grid-checkcolumn-disabled-opacity: 0.3 !default;

    $grid-checkcolumn-cell-padding:
        max(ceil(($grid-row-height - $form-checkbox-size) / 2), 0)
        right($grid-cell-inner-padding)
        max(floor(($grid-row-height - $form-checkbox-size) / 2), 0)
        left($grid-cell-inner-padding)