TT2 blocktheme – content justification over-ridden by theme

Hi all, apologies if this has been asked before, but I’m trying to figure out why certain page elements don’t respond to justify via custom css.

It seems there is a style setting somewhere that dictates certain elements are always left-justified, regardless of custom css.

I’m working on a localhost site so don’t have a live link to share, but for example:

I can set .wp-site-blocks { max-width: 1200px; } via custom css
but ‘margin: auto;’ in the same css rule has no effect and the entire page remains left-justified in the browser

or..

I have a block of custom HTML containing a css/js animation of a sound-wave,
I can set .sound-wave { justify-content: center; } and this places the animation in the center of the div,
but, the div itself containing the content remains left-justified, or if I set the property ‘margin: auto’ to the div (via a css class defined in the custom HTML), it actually disappears entirely!

I read on github that this sort of thing is a “bug” which still hasn’t been fixed.

However, I just thought I’d ask here in case anyone can suggest any work-arounds or whether there’s anything I can change in the theme.json (I’ve had a look but can’t see anything relevant at first glance.).