Css set the maximum height, using the projector projection to find that the lower part of the problem is blocked?

has anyone ever encountered this problem:
A div set the maximum height, such as 700px bar, which contains a height of 1000px , set a scroll bar, and display normally on desktops and notebooks, but when projecting with a notebook, I find that 200px is blocked below, do I need to set the maximum height down or is there any other solution?
the display is normal because it is found to be just right on the desktop, with the screen height 949px , and the notebook slightly smaller but also higher than 700px .
the problem is that it doesn"t work when projecting, and it"s blocked.

Css
Mar.13,2021

add a scroll bar

to the parent element of the div of this height: 700px.

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