Dear Support Team,
We have change the button colors from the theme options Global > Buttons and in Colors » General but for some reason it didn't change the checkout button.
Please see the attached screenshots
Please always attach a link to your website so we can check it out. If the page is offline(localhost), then our help will be limited. You will have to contact us when the page is online. Also, please make sure that the page is not under maintenance before you provide us with the link.
Please see the link below:
If you are using a button style other than Custom the shop buttons take their background color from Betheme -> Theme options -> Colors -> Content by modifying the Theme color.