Customizing the Validation Error Style
By default, invalid HTML fields in a form appear with a red border. For example, if you submit an HTML form without entering a value in a required field then the field is displayed with a red border.
You can customize the appearance of form fields in different states of validity by using the following Cascading Style Sheet pseudo classes:
:valid—Applies when an input element is valid
:invalid—Applies when an input element is invalid
:required—Applies when an input element is required (has the required attribute) ...
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