[BUG]: incorrect theme to display blockquote

[Falcion]

While the background color for preview is white, blockquote background colors depend on the theme of VS Code and this type of issue occurs:

> More details on this topic can be found in issue #104.

Looks like this (default VS Dark theme):

With default light theme:

I don't understand why this issue occurs.

... some info:

PluginId: docsmsft.docs-preview
PluginVersion: 1.0.9
OS: Windows 11 Home Single Language x64 x86_64 10.0.2263