public function button($text, $href, $buttonAlign = 'right', $innerClass = null, $args = [])
    {
        if ('right' == $buttonAlign) {
            $innerClass .= ' pull-right';
        } elseif ('left' == $buttonAlign) {
            $innerClass .= ' pull-left';
        }
        $argsstr = '';
        foreach ($args as $k => $v) {
            $argsstr .= $k . '="' . $v . '" ';
        }

        return '<a href="' . $href . '" class="btn btn-default ' . $innerClass . '" ' . $argsstr . '>' . $text . '</a>';
    }