Remove margin-right

I need to remove “margin-right” parameter in the div

<div id=”fancyboxForAlpine-title-inside”>.</div>

It contains the image opened by a click in the widget but the white corner in the bottom go outside photo. If I try to remove by the browser the margin, it’s work.

But I don’t know in which plugin file is ??

tnx

https://www.ads-software.com/plugins/alpine-photo-tile-for-pinterest/