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<!DOCTYPE html> <html> <style> div {height:50px;width:100%;} </style> <body> <h1>Gray can be set using equal values for all light sources</h1> <div style="background-color:#000000"></div> <div style="background-color:#404040"></div> <div style="background-color:#808080"></div> <div style="background-color:#c0c0c0"></div> <h1 style="color:#000000">Heading</h1> <h1 style="color:#404040">Heading</h1> <h1 style="color:#808080">Heading</h1> <h1 style="color:#c0c0c0">Heading</h1> </body> </html>