Add id to iframe Optout

Hello,

I use your nice plugin, but [wp-piwik] shortcode for optout iframe is little basic.

So it is possible to add an id to the iframe like id=wp-piwik for used with javascript to add CSS.

Or the option of Matomo in the documentation : https://matomo.org/faq/how-to/faq_25918/ for change :

• backgroundColor, a hexadecimal color string for example ffffff or ddd
• fontColor, a hexadecimal color string for example ffffff or ddd
• fontSize, a valid CSS font size for example 1.2em, 15pt, 15px or 50%
• fontFamily, a string containing only letters, space, or hyphen eg. Lucida, Courier new

If i can help you for this, ask me.

Thank you.