CSS Syntax：
CSS语法
The CSS syntax is made up of three parts: a selector, a property and a value:
CSS的语法由三部分组成: 一个选择器，一个属性和一个值：
selector {property: value}
The selector is normally the HTML element/tag you wish to define, the property is the attribute you wish to change, and each property can take a value. The property and value are separated by a colon, and surrounded by curly braces:
选择器是你希望去定义的HTML元素/标签，改变属性，每个属性可以有一个值，属性和值由冒号区分开外面用大括号括起来：
body {color: black}
Note: If the value is multiple words, put quotes around the value:
注意：如果值为多个单词则用双引号括起来：
p {font-family: “sans serif”}
Note: If you wish to specify more than one property, you must separate each property with a semicolon. The example below shows how to define a center aligned paragraph, with a red text color:
注意：如果你想指定多个属性，你就必须将每个属性用分号隔开，下面的例子就演示了怎样定义居中红色文字段落：
p {text-align:center;color:red}
To make the style definitions more readable, you can describe one property on each line, like this:
为了让样式定义更有可读性，你可以像这样分行描述属性：
p
{
text-align: center;
color: black;
font-family: aria
l}
Grouping
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