Expand prompt input area to allow longer prompts that wrap onto multiple lines

Right now, the input area is only one line, and although you can keep typing more characters, it gets very hard to read the prompt. To make this a more useful tool, allowing the user to expand (or the developer to specify) the input area to multiple lines, and having the text wrap, would be very helpful.

This should be a very easy fix, swapping out an HTML Form Text Input field for a TextArea.