Forms not responsive

So how do you make it truly responsive? Why can't we set the height to 100%? I've set my form to 2500px which displays well on desktop, but not mobile. So to make it fit on mobile, I have to increase up to 3500px and then I have 1000px of whitespace under the form on desktop..

If you set it on the smaller value you get scroll bars on the form in mobile - clients won't use that - too hard they just move my competitors site

Have played with negative margins on element under the form but this is messy and not a solution

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