Encore\Admin\Widgets\Box::style PHP Method

    public function style($styles)
    {
        if (is_string($styles)) {
            return $this->style([$styles]);
        }
        $styles = array_map(function ($style) {
            return 'box-' . $style;
        }, $styles);
        $this->attributes['class'] = array_merge($this->attributes['class'], $styles);
        return $this;
    }