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The current flag of Alabama (the second in Alabama state history) was adopted by Act 383 of the Alabama state legislature on February 16, 1895: The flag of the State of Alabama shall be a crimson cross of St. Andrew on a field of white. The bars forming the cross shall be not less than six inches broad, and must extend diagonally across the flag from side to side." – (Code 1896, §3751; Code 1907, §2058; Code 1923, §2995; Code 1940, T. 55, §5.) The cross of St. Andrew referred to in the law is a diagonal cross, known in vexillology as a saltire. Because the bars must be at least six inches (150 mm) wide, small representations of the Alabama flag do not meet the legal definition.

Source: Wikipedia