网页安全色
网页安全色是当红色（Red）、绿色（Green）、蓝色（Blue）颜色数字信号值（DAC Count）为0、51、102、153、204、255时构成的颜色组合，它一共有 6 * 6 * 6 = 216 种颜色（其中彩色为210种，非彩色6种）。216网页安全色在需要实现高精度的渐变效果或显示真彩图像或照片时会有一定的欠缺，但用于显示徽标或者二维平面效果时仍然绰绰有余。不过我们也可以看到很多网页利用其他非网页安全色做到了新颖独特的设计风格，所以我们并不需要刻意地追求局限在216网页安全色范围内使用颜色，而是应该灵活搭配使用安全色和非安全色。
216网页安全色色值
HTML#000000 RGB000
HTML#000033 RGB0051
HTML#000066 RGB00102
HTML#000099 RGB00153
HTML#0000CC RGB00204
HTML#0000FF RGB00255
HTML#003300 RGB0510
HTML#003333 RGB05151
HTML#003366 RGB051102
HTML#003399 RGB051153
HTML#0033CC RGB051204
HTML#0033FF RGB051255
HTML#006600 RGB01020
HTML#006633 RGB010251
HTML#006666 RGB0102102
HTML#006699 RGB0102153
HTML#0066CC RGB0102204
HTML#0066FF RGB0102255
HTML#009900 RGB01530
HTML#009933 RGB015351
HTML#009966 RGB0153102
HTML#009999 RGB0153153
HTML#0099CC RGB0153204
HTML#0099FF RGB0153255
HTML#00CC00 RGB02040
HTML#00CC33 RGB020451
HTML#00CC66 RGB0204102
HTML#00CC99 RGB0204153
HTML#00CCCC RGB0204204
HTML#00CCFF RGB0204255
HTML#00FF00 RGB02550
HTML#00FF33 RGB025551
HTML#00FF66 RGB0255102
HTML#00FF99 RGB0255153
HTML#00FFCC RGB0255204
HTML#00FFFF RGB0255255
HTML#330000 RGB5100
HTML#330033 RGB51051
HTML#330066 RGB510102
HTML#330099 RGB510153
HTML#3300CC RGB510204
HTML#3300FF RGB510255
HTML#333300 RGB51510
HTML#333333 RGB515151
HTML#333366 RGB5151102
HTML#333399 RGB5151153
HTML#3333CC RGB5151204
HTML#3333FF RGB5151255
HTML#336600 RGB511020
HTML#336633 RGB5110251
HTML#336666 RGB51102102
HTML#336699 RGB51102153
HTML#3366CC RGB51102204
HTML#3366FF RGB51102255
HTML#339900 RGB511530
HTML#339933 RGB5115351
HTML#339966 RGB51153102
HTML#339999 RGB51153153
HTML#3399CC RGB51153204
HTML#3399FF RGB51153255
HTML#33CC00 RGB512040
HTML#33CC33 RGB5120451
HTML#33CC66 RGB51204102
HTML#33CC99 RGB51204153
HTML#33CCCC RGB51204204
HTML#33CCFF RGB51204255
HTML#33FF00 RGB512550
HTML#33FF33 RGB5125551
HTML#33FF66 RGB51255102
HTML#33FF99 RGB51255153
HTML#33FFCC RGB51255204
HTML#33FFFF RGB51255255
HTML#660000 RGB10200
HTML#660033 RGB102051
HTML#660066 RGB1020102
HTML#660099 RGB1020153
HTML#6600CC RGB1020204
HTML#6600FF RGB1020255
HTML#663300 RGB102510
HTML#663333 RGB1025151
HTML#663366 RGB10251102
HTML#663399 RGB10251153
HTML#6633CC RGB10251204
HTML#6633FF RGB10251255
HTML#666600 RGB1021020
HTML#666633 RGB10210251
HTML#666666 RGB102102102
HTML#666699 RGB102102153
HTML#6666CC RGB102102204
HTML#6666FF RGB102102255
HTML#669900 RGB1021530
HTML#669933 RGB10215351
HTML#669966 RGB102153102
HTML#669999 RGB102153153
HTML#6699CC RGB102153204
HTML#6699FF RGB102153255
HTML#66CC00 RGB1022040
HTML#66CC33 RGB10220451
HTML#66CC66 RGB102204102
HTML#66CC99 RGB102204153
HTML#66CCCC RGB102204204
HTML#66CCFF RGB102204255
HTML#66FF00 RGB1022550
HTML#66FF33 RGB10225551
HTML#66FF66 RGB102255102
HTML#66FF99 RGB102255153
HTML#66FFCC RGB102255204
HTML#66FFFF RGB102255255
HTML#990000 RGB15300
HTML#990033 RGB153051
HTML#990066 RGB1530102
HTML#990099 RGB1530153
HTML#9900CC RGB1530204
HTML#9900FF RGB1530255
HTML#993300 RGB153510
HTML#993333 RGB1535151
HTML#993366 RGB15351102
HTML#993399 RGB15351153
HTML#9933CC RGB15351204
HTML#9933FF RGB15351255
HTML#996600 RGB1531020
HTML#996633 RGB15310251
HTML#996666 RGB153102102
HTML#996699 RGB153102153
HTML#9966CC RGB153102204
HTML#9966FF RGB153102255
HTML#999900 RGB1531530
HTML#999933 RGB15315351
HTML#999966 RGB153153102
HTML#999999 RGB153153153
HTML#9999CC RGB153153204
HTML#9999FF RGB153153255
HTML#99CC00 RGB1532040
HTML#99CC33 RGB15320451
HTML#99CC66 RGB153204102
HTML#99CC99 RGB153204153
HTML#99CCCC RGB153204204
HTML#99CCFF RGB153204255
HTML#99FF00 RGB1532550
HTML#99FF33 RGB15325551
HTML#99FF66 RGB153255102
HTML#99FF99 RGB153255153
HTML#99FFCC RGB153255204
HTML#99FFFF RGB153255255
HTML#CC0000 RGB20400
HTML#CC0033 RGB204051
HTML#CC0066 RGB2040102
HTML#CC0099 RGB2040153
HTML#CC00CC RGB2040204
HTML#CC00FF RGB2040255
HTML#CC3300 RGB204510
HTML#CC3333 RGB2045151
HTML#CC3366 RGB20451102
HTML#CC3399 RGB20451153
HTML#CC33CC RGB20451204
HTML#CC33FF RGB20451255
HTML#CC6600 RGB2041020
HTML#CC6633 RGB20410251
HTML#CC6666 RGB204102102
HTML#CC6699 RGB204102153
HTML#CC66CC RGB204102204
HTML#CC66FF RGB204102255
HTML#CC9900 RGB2041530
HTML#CC9933 RGB20415351
HTML#CC9966 RGB204153102
HTML#CC9999 RGB204153153
HTML#CC99CC RGB204153204
HTML#CC99FF RGB204153255
HTML#CCCC00 RGB2042040
HTML#CCCC33 RGB20420451
HTML#CCCC66 RGB204204102
HTML#CCCC99 RGB204204153
HTML#CCCCCC RGB204204204
HTML#CCCCFF RGB204204255
HTML#CCFF00 RGB2042550
HTML#CCFF33 RGB20425551
HTML#CCFF66 RGB204255102
HTML#CCFF99 RGB204255153
HTML#CCFFCC RGB204255204
HTML#CCFFFF RGB204255255
HTML#FF0000 RGB25500
HTML#FF0033 RGB255051
HTML#FF0066 RGB2550102
HTML#FF0099 RGB2550153
HTML#FF00CC RGB2550204
HTML#FF00FF RGB2550255
HTML#FF3300 RGB255510
HTML#FF3333 RGB2555151
HTML#FF3366 RGB25551102
HTML#FF3399 RGB25551153
HTML#FF33CC RGB25551204
HTML#FF33FF RGB25551255
HTML#FF6600 RGB2551020
HTML#FF6633 RGB25510251
HTML#FF6666 RGB255102102
HTML#FF6699 RGB255102153
HTML#FF66CC RGB255102204
HTML#FF66FF RGB255102255
HTML#FF9900 RGB2551530
HTML#FF9933 RGB25515351
HTML#FF9966 RGB255153102
HTML#FF9999 RGB255153153
HTML#FF99CC RGB255153204
HTML#FF99FF RGB255153255
HTML#FFCC00 RGB2552040
HTML#FFCC33 RGB25520451
HTML#FFCC66 RGB255204102
HTML#FFCC99 RGB255204153
HTML#FFCCCC RGB255204204
HTML#FFCCFF RGB255204255
HTML#FFFF00 RGB2552550
HTML#FFFF33 RGB25525551
HTML#FFFF66 RGB255255102
HTML#FFFF99 RGB255255153
HTML#FFFFCC RGB255255204
HTML#FFFFFF RGB255255255
