First,  you’d better disable the  auto-capitilization as follow: go to Tools > Preferences and UN-check “Automatically capitalize words.” then, Google docs has many add-on. try to use the Code Pretty Reference

Basic colors Color HTML / CSS Name Hex Code#RRGGBB Decimal Code(R,G,B) Black #000000 (0,0,0) White #FFFFFF (255,255,255) Red #FF0000 (255,0,0) Lime #00FF00 (0,255,0) Blue #0000FF (0,0,255) Yellow #FFFF00 (255,255,0) Cyan / Aqua #00FFFF (0,255,255) Magenta / Fuchsia #FF00FF (255,0,255) Silver #C0C0C0 (192,192,192) Gray #808080 (128,128,128) Maroon #800000 (128,0,0) Olive #808000 (128,128,0) Green #008000 (0,128,0) Purple #800080 (128,0,128) Teal #008080 (0,128,128) Navy #000080 (0,0,128)

ASCII printable code chart