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<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></body></html>