[Bug] Optimize dark mode on snapshot plugin

[AinuX]

Bug Info

How to reproduce?

1. Switch twitter to dark mode
2. View snapshot plugin
3. Mouse hover on vote entry

What happened?

What should happen?

Environment

Mask Version:

• (Browser) Installed from the extension store (version: )
• (App) Installed from the app store (version: )
• master branch
• Build of version/commit hash: /dev

(Please write down build command/flags if there is anything special)

System

• Windows 10
• Mac OS X Catalina
• Linux:

Platform/Browser

• Latest Chrome (stable channel)
• Latest Firefox (stable channel)
• Android 11
• iOS 14