Problem with <input type='text' /> and <textarea> width

Question

In the following code, both the INPUT and TEXTAREA elements render wider than they should. How can I limit them to 100% of the usable area within the div?

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Answer 1

@Phil has the answer, above.

Incidentally, using Firebug does, indeed, show the default borders on the textarea and input elements. So, using Firebug might have helped.