Background colors are darker than in delta --show-syntax-themes

[klapshin-marex]

Hi,

Apologies for noob question. Tried to search, but couldn't find anything. I'm running latest Ubuntu LTS (in WSL if that matters), delta package from Ubuntu apt repo. Running from gnome-terminal. Config is minimal as recommended in the getting started + added syntax-theme. The problem is that invoking just delta a.rs b.rs I see darker background red/greens than in delta --show-syntax-themes output.

Here delta /tmp/a.rs /tmp/b.rs is on the left and delta --show-syntax-theme is on the right. Both are running in gnome-terminal. Config is not changed between the calls. Both should be using same 1337 syntax-theme.

Here is my config:

[core]
    pager = delta

[interactive]
    diffFilter = delta --color-only

[delta]
    navigate = true  # use n and N to move between diff sections
    dark = true      # or light = true, or omit for auto-detection
    syntax-theme = 1337

[merge]
    conflictstyle = zdiff3

Please help me. What am I doing wrong?