Problem:

The newsletter subscription form currently does not display any confirmation or success message upon form submission.

Solution:

This issue implements a success message that appears when the user subscribes to the newsletter. The success message is displayed after the form submission and informs the user that they have successfully subscribed.

Expected Outcome:

• A success message saying "Thank you for subscribing!" appears when the user submits the newsletter form.
• The success message should be displayed below the submit button and should be styled to indicate a successful submission.