Need slightly smaller font

Found this, might be related… https://www.ads-software.com/support/topic/twenty-twelve-theme-how-to-change-post-font-size

Do not edit the Twenty Twelve theme, instead create a child theme and make your customizations.

You can add your custom CSS to the child theme’s style.css. Use browser tools like Firebug or other browser tools for CSS work. You can also use a plugin like:
https://www.ads-software.com/extend/plugins/custom-css-manager-plugin/

Thanks
I’ve followed the instructions to create a child theme and I have installed the Custom CSS Manager plug-in.
Can you help me further… I don’t know what I need to do next

Did you follow the link I posted?

Here’s a code suggested from that thread:

Try adding this to your child theme:

.entry-content p, .entry-summary p, .comment-content p, .mu_register p {
    font-size: 100%;
}

change the percentage to what you want.

thanks marviepons
that worked :O)

Do you know how to change the font too?

It’s easy if you want a font available from this list:
https://www.ampsoft.net/webdesign-l/WindowsMacFonts.html

Do you?