I am making a shopping store site with D7 and Drupal Commerce.
In the checkout pane page, there are several form fields for information of customers such as name, address, phone, and so on, have set up with default email-form and other forms with a contributed module "Customer Profile Type UI".
However, when the forms are not filled with correctly, those only show a module-generated error message for all incorrectly-filled forms altogether, but don't show red-bordered error indication for each form by generating error-css-CLASS or ID.
Is there any way to add the
<a style="color:red;">red-bordered error indication</a> in the pane page by a module? Or adding some PHP code? If the latter, could someone teach me what code to add, to which file (.module .tpl .info .api etc...) to add it?
I'm not used to PHP-coding, but might work out with a clear guidance.
Any practical answer will be appreciated.