Hi @Vince111
The default color of the buttons are white, also the background if you cant change it in the Costumize setting you can check this one.
From your Shopify admin dashboard, click on “Online Store” and then “Themes”.
Find the theme that you want to edit and click on “Actions” and then “Edit code”.
In the “Assets” folder, click on “base.css, style.css or theme.css” file, depending on which file your theme uses to store its CSS styles. At the bottom of the file, add the following CSS code:
.button, .shopify-challenge__button, .customer button {
color: black;
background: red;
}
And save.
Result:
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