Remove picture frame in Album section

Good morning.

I am currently working with SCENT theme in wordpress. I have created a model site and I am using nextgen gallery free version.

I have created three albums, and many galleries inside. My question is more aesthetic, I just would like to knowhow I can remove the white frame picture that all the pictures have, wich I guess it comes by default in the theme′s style sheet.

I enclose the link to check it out: https://www.ciaomodels.com/women-spain/

Thank you very much for your support,

Greetings,

https://www.ads-software.com/plugins/nextgen-gallery/