Vector Stars?

I’d love if the images used to show the stars would scale better on mobile. On desktop these forms look great but most of my website visitors are coming from the phone and the stars get blurry on mobile.

I don’t know code enough to get in and change the image it’s pulling (or if that’s even possible) but my guess is that it wouldn’t be hard to implement.

Any ideas?

https://ww.wp.xz.cn/plugins/contact-form-7-star-rating/