Hi Jamie,
I had the same question as you.
You won’t have to write a HTML code if you use the Wix Code API:
$w(" #button1 “).style.color = “rgba(255,0,0,1.0)”;
$w(” #button1 ").style.color = “rgb(255,0,0)”;
Here’s a website with API documentation and reference examples for changing button style in Wix.
https://www.vorbly.com/Vorbly-Code/WIX-CODE-CUSTOMIZE-BUTTON-STYLE
Hope it helps!
Cheers,
Ben