You can match the storefront to your brand without writing CSS. Colors are under Settings → Appearance. Text colors adjust automatically so buttons and tabs stay readable.
Color Settings
Button Background
Primary action buttons on product, cart, checkout, and account pages (Add to Cart, Place Order, Download, and similar).
Active Tab Background
The selected account tab, option pills, pagination highlight, and email call-to-action buttons.
Border Color
Borders on cards, tabs, form fields, and tables.
Cart & Checkout Background
Background for the cart and checkout summary panels.
Changes apply on the next page load on your site. Pick colors that fit your theme; high contrast between buttons and the page background helps customers see what to click.
What These Settings Do Not Change
Appearance settings do not restyle the WordPress admin. Email logo is set under Settings → Emails, not Appearance (though Active Tab Background also influences email CTA buttons).
Cart Icon
Add the Cart Icon block to your header or navigation so customers always see the cart. In the block settings you can choose icon style (bag, cart, or basket), size, whether to show an item count badge, whether to hide the count when the cart is empty, and an optional text label.
If Your Theme Fights The Styles
Most themes work as-is. If buttons or panels look wrong, try a small amount of CSS under Appearance → Customize → Additional CSS, or reach out for help.
For deeper layout changes (custom product templates), see Templates And Overrides in the Developers category. For PHP hooks, see Hooks and Filters.