Uh! Optimizing Your WGT Experience
. . .1024 x 768 screen resolution, preferably 1280 x 800 or higher . . .
What is the native resolution and aspect ratio of your display? 1280 x 800 has the long side 1.6 times the length of the short side
WGT is 1024 x 768 screen resolution - or the long side is 1.33 times the length of the short side.
I have my display set to 1600 x 1200, which is also 1.33, and the game client page fills my display.