Reply To: Font size on new installation

Looking in the browser developer tools, I think I can see what is happening. The problem is:

#bbpress-forums {
    background: 0 0;
    clear: both;
    margin-bottom: 20px;
    overflow: hidden;
    font-size: 12px; 
    line-height: 18px;

and then there’s also .bbp-breadcrumb and .bbp-template-notice and so on.

And then there’s this CSS class defining the width inside the standard WP entry-content:

.entry-content > *:not(.alignwide):not(.alignfull):not(.alignleft):not(.alignright):not(.is-style-wide) {
    max-width: 57rem;
    width: calc(100% - 4rem);
}

What do you recommend as the best way forward, bearing in mind I will probably forget all about this after a couple of months! 😆

A child theme from Twenty Twenty?

Or just the appropriate CSS in the WP theme Additional CSS dialog?