mmdc --backgroundColor not taken into account in linux image viewers

[TwiggyWan]

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Hi,

if I make svg like so:

$ $ mmdc -V
11.4.2
$ cat test.mermaid
sequenceDiagram
    developer ->>+ app: 1. Dev
$ mmdc -i test.mermaid -o output.svg -b 'red'

it displays background as 'red' correctly in firefox but not in gnome image viewer or ristretto or emacs. I wonder if mermaid uses some weird way of generating svg that would cause this problem?

I use debian 12 by the way.

Thanks