T-SQL UPDATE with JOIN

I have two tables.  lets say a car table and a color table.   The color table has a single record per car and has a  FK to the car table.    I am moving the color directly into the car table.  I need to migrate existing data.  So, the new car table has a color column .

I'd like an UPDATE statement that does all records; that joins the two tables and updates the new color column in the car table based on the existing data in the color table.