¿Font size in PunBB?

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE extension SYSTEM "ext-1.0.dtd">
<extension engine="1.0">
    <id>fontsize</id>
    <title>fontsize</title>
    <description>-</description>
    <author>-</author>
    <version>1.5</version>
    <minversion>1.4</minversion>
    <maxtestedon>1.4.2</maxtestedon>
    <hooks>
        <hook id="ps_preparse_tags_start"><![CDATA[
            $tags[] = 'size';
            $tags_opened[] = 'size';
            $tags_closed[] = 'size';
            $tags_inline[] = 'size';
            $tags_trim[] = 'size';
        ]]></hook>
        <hook id="ps_do_bbcode_replace"><![CDATA[
            if (!$is_signature) {
                $pattern[] = '#\[size=([6-9]{1}|[1-40-9]{2})](.*?)\[/size\]#ms';
                $replace[] = '<span style="font-size: $1px !important; line-height: $1px !important;">$2</span>';
            }
        ]]></hook>
    </hooks>
</extension>

                $pattern[] = '#\[size=([6-9]{1}|[1-40-9]{2})](.*?)\[/size\]#ms';
                $replace[] = '<span style="font-size: $1px !important; line-height: $1px !important;">$2</span>';

body {
    font-size: 100%;
}