Keyboard layout in Xwindow

I’m using pycharm on docker. The image is kongkoro/pycharm. It runs great and I love it but keyboard layout is different from what I actually have.
Shift+2 is not ‘@’, it is double quote.
I looked up how to change it but none of the solution worked.
Do you know how to change keyboard layout? I’m using US keyboard layout by the way.

$ docker version
Client:
Version: 1.12.1
API version: 1.24
Go version: go1.6.2
Git commit: 23cf638
Built: Tue, 27 Sep 2016 12:25:38 +1300
OS/Arch: linux/amd64

Server:
Version: 1.12.1
API version: 1.24
Go version: go1.6.2
Git commit: 23cf638
Built: Tue, 27 Sep 2016 12:25:38 +1300
OS/Arch: linux/amd64