liquid code
Hi @Nonso_1 
if you mean dynamic buy buttons those are injected into the page automatically.
https://help.shopify.com/en/manual/online-store/dynamic-checkout
Modifying them is not a good idea, and kinda not possible with only liquid.
If you just mean any old button that should be as simple as Link name in a custom-liquid block
Exact syntax or CSS classes will vary by theme.
Otherwise you need to put more effort into drastically improving the quality of your question than just a title and two words for a description:
https://community.shopify.com/c/blog/how-to-get-support-from-the-community/ba-p/1399408
If you need this customization created for you then contact me for services.
Contact info in forum signature.
ALWAYS please provide context, examples: store url, theme name, post url(s) , or any further detail in ALL correspondence.