Thunderbird white email background

[igel-kun]

Hi,
I'm trying out your theme, which is quite nice. However, Thunderbird seems to insist to paint the background of text-only emails white. It seems to be affected by this line:

Cloak-3.22/Cloak-3.22/gtk-3.0/gtk-contained.css

Line 24 in 0271126

background-color: transparent;