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CSS简单学习（lecture 1）简介、语法、id和class、创建

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lecture 1 简介、语法、id和class、创建

教程

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
<style>
body
{
background-color:#d0e4fe;
}
h1
{
color:orange;
text-align:center;
}
p
{
font-family:"Times New Roman";
font-size:20px;
}
</style>
</head>

<body>

<h1>CSS 实例!</h1>
<p>这是一个段落。</p>

</body>
</html>

1简介

CSS （Cascading Style Sheets）层叠样式表

2语法

<html>
<head>
<style>
body {background-color:yellow;}
h1   {font-size:36pt;}
h2   {color:blue;}
p    {margin-left:50px;}
</style>
</head>

<body>

<h1>This header is 36 pt</h1>
<h2>This header is blue</h2>

<p>This paragraph has a left margin of 50 pixels</p>

</body>
</html>

<html>
<head>
<style>
body {background-color:tan;}
h1   {color:maroon;font-size:20pt;}
hr   {color:navy;}
p    {font-size:11pt;margin-left:15px;}
a:link    {color:green;}
a:visited {color:yellow;}
a:hover   {color:black;}
a:active  {color:blue;}
</style>
</head>

<body>

<h1>This is a header 1</h1>
<hr>

<p>You can see that the style
sheet formats the text</p>

<p><a href="http://www.w3cschool.cc"
target="_blank">This is a link</a></p>

</body>
</html>

3Id和Class选择器

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
<style>
#para1
{
text-align:center;
color:red;
}
</style>
</head>

<body>
<p id="para1">Hello World!</p>
<p>这个段落不受该样式的影响。</p>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
<style>
.center
{
text-align:center;
}
</style>
</head>

<body>
<h1 class="center">标题居中</h1>
<p class="center">段落居中。</p>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
<style>
p.center
{
text-align:center;
}
</style>
</head>

<body>
<h1 class="center">这个标题不受影响</h1>
<p class="center">这个段落居中对齐。</p>
</body>
</html>