[Plugin: Testimonials Manager] Can’t edit testimonial styles

No matter what I do, I cannot change the styles of the testimonials widget. Anyone else have this trouble?

https://tinyurl.com/398qr3c

It’s in the left sidebar toward the bottom. For now, I have the following:

.testimonials_manager_widget{
width: 100px;
background: #ffffff;
border: 0;
 margin: 10px 0;
 padding:10px;
}

But it’s still using the default styles.

Any ideas are appreciated. Thanks!

https://www.ads-software.com/extend/plugins/testimonials-manager/