Question / Help Warcraft 3, not in full screen? help please

[Spencer Campbell]

Hey guys need some help!, Thinking theres an easy fix for this but whenever i record warcraft 3 it isnt full screen and theres black on the bottom and to the right. thanks!
Heres the video for example:
https://www.twitch.tv/videos/139530924

 

[Osiris]

The canvas resolution in OBS isn't the same as the game's resolution.