How can I alter the color of button labels in the Refresh theme?

[Dif1]

How do I change the colour of the button label. I have theme "Refresh" (free theme). 

[Growave1]

Hi there,  
  
Thank you for reaching out! My sincerest apologies for not getting back to you about your question sooner due to the weekend and changing shifts.  
  
In order to assist you more effectively, I would appreciate it if you could provide us with some additional information (E.g. the email address of the store owner or the URL of the store with the myshopify.com domain).
The more information you can give us, the better we will be able to understand the request and provide you with a prompt and accurate resolution 🤗.  

P.s.: the URL you provided unfortunately can’t be reached.
  
We appreciate your cooperation in this matter, and please let us know if you have any questions or concerns. We are committed to resolving your issue as quickly and effectively as possible 😊.    
    
Thank you in advance. Looking forward to hearing from you! 

[miguel_liquify]

Can you provide your store URL?