To put Make Booking button a little higher, you can do several things.
First, you can set Show Booking summary Step 2 = NO at Backend -> Design settings, this will remove Booking summary block at Step 2. Then I think you should set iFrame height to 1000, Booking Form is optimized for 1000px. The best will be if you can increase the width of Booking Form, our Booking Form is completely responsive for all screens, you can see a preview here https://booking.drivenot.com/nl/company-preview#mitch. So, it should take less height if you can remove the Right block from Booking page here http://www.ahrotax.nl/airport-taxi and allow the Booking Form having more width.
Hope this helps
Ronniee
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