In the folder: "House_of_Maids_Steam_v0.3.11\resources\Graphics\Pictures"
backup "msgbox_ground.png" (rename it to whatever)
then replace it with the one in the attachment (source:
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)
Now you have a transparent background.
This is better than having half the window blocked.
Edit:
Definitely backup the original.
I am constantly switching them around, cause the menu buttons sometimes disappear....