We added another Q&A to our list of Top Support Questions which details several techniques for changing the size of the TextBox. See
http://www.basicdatepicker.com/support/#q5Our favorite is probably Option #3. A straightforward CSS edit that we add to our global .css file and the style is picked up application wide by all date pickers. eazy peazy. No source code (.aspx/code-behind) edits is also a bonus.
Thanks,
Geoffrey McGill
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Coolite Inc.
Email: support [at] coolite [dot] com
Phone: +1(888)775-5888