Custom Field Name using CSS

Hi, this plug-in works really well for my site. https://shop.elegment.com

I am looking for a quick way to change the field name on the contact form. I have attached a screen capture of what I want to achieve here:
https://shop.elegment.com/wp-content/uploads/2019/11/Shop.Elegment.Com_-scaled.jpg

Would I be able to use CSS to achieve this, without going through language translation?

Warm Regards,

Xing Gao

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