.#{$prefix}grid-cell-checkcolumn .#{$prefix}grid-cell-inner {
    // !important needed to override .x-tree-panel .x-grid-cell-inner's padding setting.
    padding-top: floor(($grid-row-height - $grid-cell-border-width - $form-checkbox-size) / 2)!important;
    padding-bottom: 0!important;
}

.#{$prefix}grid-checkcolumn {
    width: $form-checkbox-size;
    height: $form-checkbox-size;
    background: theme-background-image($form-checkbox-image) 0 0 no-repeat;

    .#{$prefix}item-disabled & {
        @include opacity($grid-checkcolumn-disabled-opacity);
    }
}

.#{$prefix}grid-checkcolumn-checked {
    background-position: 0 (0 - $form-checkbox-size);
}