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CSS 颜色

使用CSS时,您可以指定不同方式范围内的颜色。

我们可以使用预定义的颜色名称。或者我们可以为每个红色,绿色和蓝色组件使用十进制或十六进制值。

十进制值由逗号分隔,十六进制值为通常以#为前缀,如#ffffff,表示白色。

下表具有一些预定义的颜色名称及其十进制和十六进制等效值。

颜色名称 十六进制 十进制
black #000000 0,0,0
green #008000 0,128,0
silver #C0C0C0 192,192,192
lime #00FF00 0,255,0
gray #808080 128,128,128
olive #808000 128,128,0
white #FFFFFF 255,255,255
yellow #FFFF00 255,255,0
maroon #800000 128,0,0
navy #000080 0,0,128
red #FF0000 255,0,0
blue #0000FF 0,0,255
purple #800080 128,0,128
teal #008080 0,128,128
aqua #00FFFF 0,255,255

这些被称为基本颜色名称。

下表显示了可以使用的扩展灰度阴影。

颜色名称 十六进制 十进制
darkgray #a9a9a9 169,169,169
darkslategray #2f4f4f 47,79,79
dimgray #696969 105,105,105
gray #808080 128,128,128
lightgray #d3d3d3 211,211,211
lightslategray #778899 119,136,153
slategray #708090 112,128,144

RGB值简写

对红色,绿色和蓝色分量使用十六进制值。每对都是十六进制符号,范围为00 – FF。

十六进制值通常以#作为前缀,如#ffffff,表示白色。 “纯”蓝色将被写入#0000FF,“纯”红色被写入#FF0000。

#RGB是上述六位数符号的较短形式。在此格式中,每个数字都被复制以获得等效的六位数值,例如#F7C变为#FF77CC。

<!DOCTYPE HTML>
<html>
    <head>
        <style>
body {
    background-color: yellow;
}

div#one {
    width: 50px;
    height: 50px;
    border: 1px solid rgb(128, 128, 128);
    margin: 5px;
    float: left;
    background-color: #000;
}
        </style>
    </head>
    <body>
        <div id="one"></div>
    </body>
</html>

颜色函数

颜色名称和简单的十六进制值不是您可以指定颜色的唯一方法。

有许多函数允许您选择颜色。

  • rgb(r,g,b)使用RGB模型指定颜色。
    示例:rgb(112,128,144)
  • rgba(r,g,b,a)使用RGB模型指定颜色,添加了alpha值以指定不透明度。 值为0是完全透明的; 值为1是完全不透明的。
    示例:rgba(112,128,144,0.4)
  • hsl(h,s,l)使用色相,饱和度和亮度(HSL)模型指定颜色。
    示例:hsl(120,100%,22%)
  • hsla(h,s,l,a)使用alpha值来指定不透明度。
    示例:hsla(120,100%,22%,0.4)

rgb(rrr.rr%,ggg.gg%,bbb.bb%)使用0%到100%范围内的RGB值,允许十进制值(例如75.5%)。因此,黑色的值将是rgb(0%,0%,0%),而蓝色将是rgb(0%,0%,100%)。

rgb(rrr,ggg,bbb)中,接受的值范围是0-255。范围是十六进制的00-FF的十进制等效值。在此格式中,绿色将为rgb(0,255,0),白色将表示为rgb(255,255,255)。

下表列出了颜色名称,十六进制颜色值和rgb颜色值。

颜色 HEXCOLOR RGB颜色
Black #000000 rgb(0,0,0)
Red #FF0000 rgb(255,0,0)
Green #00FF00 rgb(0,255,0)
Blue #0000FF rgb(0,0,255)
Yellow #FFFF00 rgb(255,255,0)
Cyan #00FFFF rgb(0,255,255)
Magenta #FF00FF rgb(255,0,255)
Gray #C0C0C0 rgb(192,192,192)
White #FFFFFF rgb(255,255,255)

以下代码显示如何使用色彩函数。

<!DOCTYPE HTML> 
<html> 
<body> 
    <p style="background-color:#C0C0C0"> 
    Color set by using hex value 
    </p> 
    <p style="background-color:rgb(192,192,192)"> 
    Color set by using rgb value 
    </p> 
    <p style="background-color:gray"> 
    Color set by using color name 
    </p> 
</body> 
</html>

在上面的代码中,我们使用各种形式的颜色值来设置段落的背景颜色。

CSS3中的扩展颜色关键字

颜色 名称 十六进制 RGB
aliceblue #f0f8ff 240,248,255
antiquewhite #faebd7 250,235,215
aqua #00ffff 0,255,255
aquamarine #7fffd4 127,255,212
azure #f0ffff 240,255,255
beige #f5f5dc 245,245,220
bisque #ffe4c4 255,228,196
black #000000 0,0,0
blanchedalmond #ffebcd 255,235,205
blue #0000ff 0,0,255
blueviolet #8a2be2 138,43,226
brown #a52a2a 165,42,42
burlywood #deb887 222,184,135
cadetblue #5f9ea0 95,158,160
chartreuse #7fff00 127,255,0
chocolate #d2691e 210,105,30
coral #ff7f50 255,127,80
cornflowerblue #6495ed 100,149,237
cornsilk #fff8dc 255,248,220
crimson #dc143c 220,20,60
cyan #00ffff 0,255,255
darkblue #00008b 0,0,139
darkcyan #008b8b 0,139,139
darkgoldenrod #b8860b 184,134,11
darkgray #a9a9a9 169,169,169
darkgreen #006400 0,100,0
darkgrey #a9a9a9 169,169,169
darkkhaki #bdb76b 189,183,107
darkmagenta #8b008b 139,0,139
darkolivegreen #556b2f 85,107,47
darkorange #ff8c00 255,140,0
darkorchid #9932cc 153,50,204
darkred #8b0000 139,0,0
darksalmon #e9967a 233,150,122
darkseagreen #8fbc8f 143,188,143
darkslateblue #483d8b 72,61,139
darkslategray #2f4f4f 47,79,79
darkslategrey #2f4f4f 47,79,79
darkturquoise #00ced1 0,206,209
darkviolet #9400d3 148,0,211
deeppink #ff1493 255,20,147
deepskyblue #00bfff 0,191,255
dimgray #696969 105,105,105
dimgrey #696969 105,105,105
dodgerblue #1e90ff 30,144,255
firebrick #b22222 178,34,34
floralwhite #fffaf0 255,250,240
forestgreen #228b22 34,139,34
fuchsia #ff00ff 255,0,255
gainsboro #dcdcdc 220,220,220
ghostwhite #f8f8ff 248,248,255
gold #ffd700 255,215,0
goldenrod #daa520 218,165,32
gray #808080 128,128,128
green #008000 0,128,0
greenyellow #adff2f 173,255,47
grey #808080 128,128,128
honeydew #f0fff0 240,255,240
hotpink #ff69b4 255,105,180
indianred #cd5c5c 205,92,92
indigo #4b0082 75,0,130
ivory #fffff0 255,255,240
khaki #f0e68c 240,230,140
lavender #e6e6fa 230,230,250
lavenderblush #fff0f5 255,240,245
lawngreen #7cfc00 124,252,0
lemonchiffon #fffacd 255,250,205
lightblue #add8e6 173,216,230
lightcoral #f08080 240,128,128
lightcyan #e0ffff 224,255,255
lightgoldenrodyellow #fafad2 250,250,210
lightgray #d3d3d3 211,211,211
lightgreen #90ee90 144,238,144
lightgrey #d3d3d3 211,211,211
lightpink #ffb6c1 255,182,193
lightsalmon #ffa07a 255,160,122
lightseagreen #20b2aa 32,178,170
lightskyblue #87cefa 135,206,250
lightslategray #778899 119,136,153
lightslategrey #778899 119,136,153
lightsteelblue #b0c4de 176,196,222
lightyellow #ffffe0 255,255,224
lime #00ff00 0,255,0
limegreen #32cd32 50,205,50
linen #faf0e6 250,240,230
magenta #ff00ff 255,0,255
maroon #800000 128,0,0
mediumaquamarine #66cdaa 102,205,170
mediumblue #0000cd 0,0,205
mediumorchid #ba55d3 186,85,211
mediumpurple #9370db 147,112,219
mediumseagreen #3cb371 60,179,113
mediumslateblue #7b68ee 123,104,238
mediumspringgreen #00fa9a 0,250,154
mediumturquoise #48d1cc 72,209,204
mediumvioletred #c71585 199,21,133
midnightblue #191970 25,25,112
mintcream #f5fffa 245,255,250
mistyrose #ffe4e1 255,228,225
moccasin #ffe4b5 255,228,181
navajowhite #ffdead 255,222,173
navy #000080 0,0,128
oldlace #fdf5e6 253,245,230
olive #808000 128,128,0
olivedrab #6b8e23 107,142,35
orange #ffa500 255,165,0
orangered #ff4500 255,69,0
orchid #da70d6 218,112,214
palegoldenrod #eee8aa 238,232,170
palegreen #98fb98 152,251,152
paleturquoise #afeeee 175,238,238
palevioletred #db7093 219,112,147
papayawhip #ffefd5 255,239,213
peachpuff #ffdab9 255,218,185
peru #cd853f 205,133,63
pink #ffc0cb 255,192,203
plum #dda0dd 221,160,221
powderblue #b0e0e6 176,224,230
purple #800080 128,0,128
red #ff0000 255,0,0
rosybrown #bc8f8f 188,143,143
royalblue #4169e1 65,105,225
saddlebrown #8b4513 139,69,19
salmon #fa8072 250,128,114
sandybrown #f4a460 244,164,96
seagreen #2e8b57 46,139,87
seashell #fff5ee 255,245,238
sienna #a0522d 160,82,45
silver #c0c0c0 192,192,192
skyblue #87ceeb 135,206,235
slateblue #6a5acd 106,90,205
slategray #708090 112,128,144
slategrey #708090 112,128,144
snow #fffafa 255,250,250
springgreen #00ff7f 0,255,127
steelblue #4682b4 70,130,180
tan #d2b48c 210,180,140
teal #008080 0,128,128
thistle #d8bfd8 216,191,216
tomato #ff6347 255,99,71
turquoise #40e0d0 64,224,208
violet #ee82ee 238,130,238
wheat #f5deb3 245,222,179
white #ffffff 255,255,255
whitesmoke #f5f5f5 245,245,245
yellow #ffff00 255,255,0
yellowgreen #9acd32 154,205,50

例子

以下代码显示如何使用颜色名称及其相应的RGB值和十六进制等效值。


<!DOCTYPE HTML>
<html>
<head>
<title>Named colors in CSS</title>
<style type="text/css">
table {
  border-spacing: 2em 1em;
  margin:25px auto;
}
caption {
  font-family:Tahoma, Geneva, sans-serif;
  font-weight:bold;
  font-size:20px;
}
td {
  border: #000 solid 1px;
  text-align:center;
  padding:10px;
  font-family:Tahoma, Geneva, sans-serif;
  font-size:14px;
  font-weight:bold;
  color:#FFF;
  width:7em;
  white-space: pre;
}
#aqua {
  background-color:aqua;
}
#black {
  background-color:black;
}
#blue {
  background-color:blue;
}
#fuchsia {
  background-color:fuchsia;
}
#gray {
  background-color:gray;
}
#green {
  background-color:green;
}
#lime {
  background-color:lime;
}
#maroon {
  background-color:maroon;
}
#navy {
  background-color:navy;
}
#olive {
  background-color:olive;
}
#purple {
  background-color:purple;
}
#red {
  background-color:red;
}
#silver {
  background-color:silver;
}
#teal {
  background-color:teal;
}
#white {
  background-color:white;
}
#yellow {
  background-color:yellow;
}
#aqua, #fuchsia, #lime, #red, #silver, #white, #yellow {
  color:black;
}
</style>
</head>

<body>
<table>
    <caption>
    Basic Color Keywords
    </caption>
    <tr>
        <td id="aqua">aqua
#00FFFF
0, 255, 255</td>
        <td id="black">black
#000000
0, 0, 0</td>
        <td id="blue">blue
#0000FF
0, 0, 255</td>
        <td id="fuchsia">fuchsia
#FF00FF
255, 0, 255</td>
    </tr>
    <tr>
        <td id="gray">gray
#808080
128, 128, 128</td>
        <td id="green">green
#008000
0, 128, 0</td>
        <td id="lime">lime
#00FF00
0, 255, 0</td>
        <td id="maroon">maroon
#800000
128, 0, 0</td>
    </tr>
    <tr>
        <td id="navy">navy
#000080
0, 0, 128</td>
        <td id="olive">olive
#808000
128, 128, 0</td>
        <td id="purple">purple
#800080
128, 0, 128</td>
        <td id="red">red
#FF0000
255, 0, 0</td>
    </tr>
    <tr>
        <td id="silver">silver
#C0C0C0
192, 192, 192</td>
        <td id="teal">teal
#008080
0, 128, 128</td>
        <td id="white">white
#FFFFFF
255, 255, 255</td>
        <td id="yellow">yellow
#FFFF00
255, 255, 0</td>
    </tr>
</table>
</body>
</html>

上面的代码呈现如下:

css

颜色

扩展颜色关键字


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