Hmm thanks for the screenshot - I can reproduce this if I zoom in on the page in my browser. If you zoom out on the page, does that fix the problem? We did not make our UI scalable for different resolutions so possibly that's why this is happening
There have been some reports that the game's viewports do not scale correctly on non 16:9 aspect ratio resolutions. A workaround fix would probably be to set your desktop resolution to 1280x720, or 1920x1080. Sorry for the inconvenience!