You can apply a vertical-align style (e.g. "middle") to the Add button and the regular textboxes in order to achieve better alignment.
The regular textboxes are higher than the DatePicker, which can be resolved by applying a suitable vertical padding. Note that the padding styles are cyurrently set in em's, which make them depend on the font-size. You can reset them in pixels if you want.
padding-top: ...... ;
padding-bottom: ...... ;
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