How to make "Client" images become bigger?

I dd download the plugin for “Sydney” for my website, to display my “clients”. But their logos become very small, even if its a big sized image.

Is there any way to make it bigger?
I’ve checked the php files if there was any codes to change there, but could’nt find any with size.

Sincerely, a confused and thankful, Developer.

Hello there,

Try to enlarge the client item container using the following CSS code:

.roll-client .client-item {
   width: 25%;   

You can apply it on your site by adding this code into Appearance > Customize > Additional CSS.