Refer the Step 4:

Start the Tailwind CLI build process (source: Tailwind CSS v3 installation steps)

the question is once I run the CLI command for CSS processing rebuilding and done is OK with no errors.

npx tailwindcss -i input.css -o output.css --watch

However after that my cursor keeps blinking forever, so I cant issue any more CLI commands so then I need to hit CTRLC (say couple of times) to get a message Terminate batch job (Y/N) and I choose Y and then its normal command line prompt. This is an irritant.

I can't call any more commands in the terminal while the command is running. How can I issue a command while it is running?