I have a form with rules. When a specific option is selected, it display new fields.

My problem is when the new fields appear, the height of the form remains the same and in one particular form, it makes the "submit" button to disappear.

I tryed height:auto or height:100%... but noting works. 

If if choose to specify the height in pixels, the forms doesn't adapt when the new fields appears.

someone can help me ?

Thanks