To configure email templates, Go to admin panel > WooCommerce > Settings > Emails > Email sender options.

This section lets you customize WooCommerce emails.

Header imageEnter the URL of an image you want to show in the email header.
Footer textEnter the footer text of an you want to show in the email footer.
Base colorColor for WooCommerce email templates.
Background colorBackground color for WooCommerce email templates.
Body background colorMain body background color.
Body text colorMain body text color.

You can also check preview “Click here to preview your email template.”