A fork of Operaldi That aims at mimicking Opera Air aesthetics
Screenshots:
Dark mode




Light mode




- Download the CSS file
- Type vivaldi://experiments in the URL bar and check Allow CSS modifications
- Open Vivaldi Settings
- Appearance > CUSTOM UI MODIFICATIONS and select the folder in which you downloaded the CSS.
- Appearance > Status Bar > Hide Status Bar
- Themes > New Theme... and follow the screenshots below:
Colors:

Background (my recommendations):
https://abhishekkumarsahu.gumroad.com/l/driftwall (choose free version)
https://github.com/JustAdumbPrsn/Zen-Nebula/releases/tag/v3.1
OR my favorite option

Settings:

Icons (optional):
You can replace the default icons with mine from this repository.
- Restart Vivaldi
- Enjoy your new CSS
Start page search bar is now blurred Start page Navigation bar is now themed thanks to "https://forum.vivaldi.net/topic/47116/transparent-startpage-navigation-bar-configurable"

fixed INNER ROUND BORDERS margin
fix right sidebar margin issue fix inner corners margin issue when hiding sidebar
made the navigation bar adaptive
Merged pull request - Recenter New tab/bin/cloud icons on the tab bar, thnx Ryfters
Added version number
Align Window controls and Vivaldi button with tab bar and increase top padding, thnx Ryfters
v.8 adjusting the blur in tab stack and removing unnecessary lines
bug fix: add padding to bottom tabs when using tab stack
add webpanels theming merged from Skolodac

fixed bottom margin on left and right tab bar style

Fixed windows buttons overlay again

Fix missing margin between bottom and sidebar

Collapse header/titlebar completely when tabs are hidden
for those who likes horizontal menu , it's now styled!

v14.1 : hotfix to horizontal menu bar theming, now it works with other tab styles
fix sidebar webpanel content when it is on the right , as content appeared missaligned
clean sidebar code
Merga pullrequest : A few changes (panels, statusbar, vars and widgets) thnx Ryfters
now sidepanel content is blurred and we have aa blured statusbar
V.16 hotfix : Fixed ghost sidebar issue and persistent sidebar margin issue
Merge pull request Ryfters
transition not always working
tree items background
V17.1 : Fix background for history panel
fix vertical tabs side and top margins, remove unneeded code
v18.1 : unify the vertical tabs margins code
v18.2 : fix bookmark bar overlap issue
Fixed titlebar in settings and popup windows
Update 19.1: fullscreen mode now have inner round
update 19.2 : removed inner rounds from full screen as it cause issues with videos full screen and fix gaps
update 19.3: Fix window buttons alignment in vertical tabs mode
Fixed floating panel
v20.1: hotfix for sidebar
FIX Colored Tab Groups
v21.1: fix windows button alignment when hiding tab bar
v21.2: change collapse title bar approach to fix bug with the horizontal settings
fixed workspace thnx to operaldi
Themed address bar when moved to the tab bar (vivaldi 7.6 fix)
Fixed stacking issue caused by vivaldi new update
v24.1: fixed setting button appears under the tab bar
v24.2: themed search box in the tab bar
v24.3 : fixed sidebar rounding issue for some users
v24.4 : increase transparency of selected tab and address bar