Working on thumbnail

Hi,

I’d like to know how to…

– I would have the position of the thumbnail orizontally centered

I’ve tried to add the parameters to my custom theme css
.yuzo_related_post{margin-left:auto;
margin-right:auto;
width:auto;}
.yuzo_related_post .relatedthumb{margin-left:auto;
margin-right:auto;
width:auto;}
but it didn’t worked

– I would have a proporional resize of the original image (not just a raw cropping)

Thank you in advance!

https://www.ads-software.com/plugins/yuzo-related-post/