How to make the height responsive for the fullscreen mode?

[taowang1993]

Currently I am using height: 645. It works fine on my macbook air.

But when I switch to smaller screens, there will be a scrollbar on the right.

height 645 on macbook air

scrollbar appears on smaller screens

645 too small on big screens

Should I just delete the height? I tried setting it to 100%, but it did not work.

[bendadaniel]

Same height 100% does not work.

chatWindow: {
height: "100%",
}