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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:rgb(0,0,0)"></div> <div style="background-color:rgb(64,64,64)"></div> <div style="background-color:rgb(128,128,128)"></div> <div style="background-color:rgb(192,192,192)"></div> <h1 style="color:rgb(0,0,0)">Heading</h1> <h1 style="color:rgb(64,64,64)">Heading</h1> <h1 style="color:rgb(128,128,128)">Heading</h1> <h1 style="color:rgb(192,192,192)">Heading</h1> </body> </html>