Got these scripts from:

# curl -LO 'https://misc.flogisoft.com/_export/code/bash/tip_colors_and_formatting?codeblock=55'
# curl -LO 'https://misc.flogisoft.com/_export/code/bash/tip_colors_and_formatting?codeblock=56'

./colors.sh     | less -FRX
./colors-256.sh | less -FRX