XF 1.5 CSS

Hello, so I am trying to configure the names of Admins or other users on my website. I see you use CSS - https://gyazo.com/8ce79e7e75a7ab0516f3685409ac7622 I am not sure what the codes are I see some pretty complicated ones: https://gyazo.com/c2b7376bacc8cb5d40c214ef442415e7 and I have no idea how these are formated, like if you play Minecraft you know that &5 would be purple as a code, if someone has a list handy of these or will tell me how to format them that would be great!