Graph bgcolor changing to grey

[achu_sab]

I have a problem with my graphs , Sometimes its background color become grey colored. Is there is any configuration change needed to keep the graphs white colored background as such ? Please help me

[erisan500]

Change the working hours.
The gray background = non working hours.

Greetings

[achu_sab]

I have changed the working hours from 1-5,00:00-24:00 to 1-7,00:00-24:00 . Now it works.
thanks