Change drop down height and width

Hello!

I'm a long-time JotForm user and use it for everything!  I injected some custom CSS to make text imput areas look like iPhone input areas.  Everything looks and works so perfectly!  I have one issue: Drop down menus still look the same and I want to adjust their style to look more like the rest of the form.  Basically, everything is very big and bold, but the drop downs are small and thin.  

When I adjust the CSS to increase the width and height of the drop down, it comes out looking super blury/pixelated.  Any ideas?  

Thanks so much for everything!!!