Thanks, Jimmy. Using your comments as a start, I was able to determine another way of changing the field widths as well. (I also increased my HTML knowledge in the process!) I'm passing the information on in case others reading this thread might find it useful to their situation.
For the Contact Name and Email fields, I added a 'size' parameter to the <input> tag to change the width of those fields, and for the Comments field, I added a 'cols' parameter to the <textarea> tag to change the width of that field.