Button on Slider – can they be modified with rounded edges?

Hello!

I would like to change my buttons on my slider (and anywhere else on my site if I want to add buttons) from being rectangular to having rounded edges. The main reason is I want it to look like my thinkific site (which I will integrate with WP soon). The buttons on my thinkific site look like this: https://jennyelenihealth.thinkific.com.

Any help in customising my buttons on my WP site to be rounded will be a great help!!

(P.S. I have nimble builder with my customizr WP Theme)

Regards,
Jenny

The page I need help with: [log in to see the link]