Update I have created a css template you can use

here

TFL are really picky about the colours used to represent the London Underground, and it's a pain in the arse trying to find the true hex colour codes as the ones of their website are "web safe" for old browsers, and not actually their true colours.

Below is a table showing the actual true hex colour for each line;

Line Hex Code Bakerloo #B36305 Central #E32017 Circle #FFD300 District #00782A DLR #00A4A7 Hammersmith and City #F3A9BB Jubilee #A0A5A9 Metropolitan #9B0056 Northern #000000 Overground #EE7C0E Piccadilly #003688 Tramlink #84B817 Victoria #0098D4 Waterloo and City #95CDBA

Enjoy,

Rich