My prefered styles for Vivaldi on macOS.
Replace the files in:
/Applications/Vivaldi.app/Contents/Frameworks/Vivaldi Framework.framework/Versions/2.8.1664.44/Resources/vivaldi/style/
with the provided files.
Tab Styles
- Moves the close button to the left side of the tab.
- Moves the audio icon to the right side of the tab.