How to center the effect in the center of an article?

Hi,
I have managed to instal the extension and to use it inside one (test) article.
My issue is that the images are only aligned to the left of the page.
How can I align them in the center?
How can I chose a given position within the article?
(I tried different ways but I didn't succeed)


Any suggestion is more than welcome!
thanks
Giacomo

Just a short additional detail:
if the effect is set a 100% it will display correctly.
the issue of centering the effect is given when you set a size smaller than 100%, like in my case of 80% or 90%

thanks a lot!
it worked flawlessly

I was too fast on answering.

The effect is fine on computer and through devtools (from chrome) looks fine in all devices.

however.. on my Huawei P30 Pro, with chrome is still aligned left.
(I cleaned the cache of the browser before reloading)
On the P30 Pro is OK with Firefox and other browsers..

Any hint?