Mild ale is a simple beer to make, but an extremely difficult style to pin down. Although light in body and alcohol, it is complex and full of flavor.Designing Great Beers: The Ultimate Guide to Brewing Classic Beer Styles. Boulder, Colo.: Brewers Publications, 1996. . The Perfect Pint: Producing Real Ale in America. Chicago: Craft Beer Institute, 1998. Daniels, Ray, and Jim Parker.