It sounds like you want to type a hex color value into a cell and have the cell to the right change to be whatever color you typed in. That can be done with VBA. This sub is written to leave in the Sheet object although you could generalize it to work in the Workbook object if you want it to apply to all sheets.
Private Sub Worksheet_Change(ByVal Target As ...
I think WindowTop (Git) might be just what you're looking for.
Just tested the old v3.x version and it works fine in inverting the colors of just my LibreOffice window/task/app/program.
Stumbled over it in issue 5 of NegativeScreen's Git repo.
Here is the code to safely enable Console Virtual Terminal Sequences in your own programs. It's more or less a cut and paste of the code from the Microsoft site with a couple of cursor position control codes on the end.
using namespace std;
HANDLE hOut = GetStdHandle(STD_OUTPUT_HANDLE);
This is done in Settings > Personalization > Colors.
Turn the Transparency effects to Off in order to see the taskbar and
Start/search in black color:
For more information see the article
How To Make Windows 11 Taskbar Black (Without Dark Mode).
The Chrome team just decided to make 'em a bit more colourful. Copy 'em to a text editor that does not support images (e.g. Notepad) and it'll show the boring black/white versions. Printing them as they appear in Chrome would probably require saving the page as an image/pdf (multiple plugins exist that can do that) and printing that. For example GoFullPage ...
I know this question is from a year ago but what helped me was the NVIDIA control panel, just play around with the brightness and contrast settings, I keep the brightness low (15-30max and then just make the contrast brighter. I would recommend testing this on a good template or something.
After filing a bug report, i got a hint that there's a different but known LO calc bug involved, thus i can only propose a workaround (which worked with your test data):
Define the conditional formatting for cell range C2:F2, with min defined as value "0" and max as formula "=INDIRECT("B" & ROW())". The INDIRECT() function ...