Taxis are white but, if you see one, don't try to flag it down because they aren't allowed to stop just anyway. Head for a rank, located close to the main piazzas and attractions.
You can also call for a radio taxi, but be aware that operators often don't speak English, and the driver will charge you from when you made the call, as opposed to when he picked you up.
Taxis licensed to operate at the airports must apply fixed rates on certain routes - regardless of the amount that may indicate the meter - inclusive of all costs, tolls, and charges). Malpensa Airport – Milan (anywhere within city limits) or vice versa: 90€