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I checked your form http://www.jotform.co/form/61581869974879 because it is the one that has Dynamic Dropdown widget but the widget already has a height of 34px. The width of the widget changes because it adopts to width of the form and the screen.
The max-width of the widget was also set to 600px so I think it is fine.
If you are referring to a different form though, please give us the form link and we will be happy to assist you further.