Bed Dimension - Center Calibration

My print is off a lil from the center of the bed. I did a quick dirty job to calibrate.
From the photo, you can see in my case the center is off 4 mm to the left and 8 mm to the top.

I drew the center line in the back of the glass before I printed this part. To fix this, I did the following commands in the terminal:
Shift the bed dimension to the right 4 mm and forward 8 mm
->> M206 X-4 Y8
save it to EEPROM with M500

Please prefer to your printer's configuration and coo