gutters and actual screen size in terminal programs

[1xch]

vim in the terminal creates right and bottom gutters:

In urxvt i was able to fix this with:

URxvt*externalBorder: 0
URxvt*internalBorder: 0

in .Xresources

It is a small thing, but I am wondering where and if I can configure this in st -- terminal programs such as vim create disjointed right and bottom buffer that isnt solved within the program.