How should I adjust the height of the PC version if the page height of the mobile design is different from the page height of the PC design?

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I’ve been using bubble to create a website with a focus on design.
In this case, the height of the PC version is 2000px and the height of the smartphone version is 3000px. If I set the index to 3000px, there will be a space of 1000px when displayed on a PC.
In this case, if I set the index to 3000px, there will be a space of 1000px when I view it on a PC. How can I adjust the index to display 2000px on a PC and 3000px on a smartphone?