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<!DOCTYPE html> <html> <body> <h1>Shades of gray</h1> <p>By using equal values for red, green, and blue, you will get different shades of gray:</p> <h2 style="background-color:#3c3c3c;">#3c3c3c</h2> <h2 style="background-color:#616161;">#616161</h2> <h2 style="background-color:#787878;">#787878</h2> <h2 style="background-color:#b4b4b4;">#b4b4b4</h2> <h2 style="background-color:#f0f0f0;">#f0f0f0</h2> <h2 style="background-color:#f9f9f9;">#f9f9f9</h2> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>