css.day04.eg

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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>外边距合并</title>
<style type="text/css">
  .top{width:300px; height:150px; background-color:#F00; margin-bottom:50px;}
  .bottom{width:300px; height:150px; background-color:#0F0; margin-top:100px;}
</style>
</head>
<body>
<div class="top"></div>
<div class="bottom"></div>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>外边距合并</title>
<style type="text/css">
  .father{width:300px; height:150px; background-color:#F00; overflow:hidden;}
  .son{width:100px; height:50px; background-color:#0F0; margin-top:50px; }
</style>
</head>
<body>
<div class="father">
    <div class="son"></div>
</div>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>浮动</title>
<style type="text/css">
.top,.bottom{width:300px; height:150px; background-color:#F00;}
.top{float:left;}
.bottom{background-color:#0F0; float:right;}
</style>
</head>
<body>
<div class="top">
</div>
<div class="bottom"></div>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>浮动</title>
<style type="text/css">
.one,.two{width:200px; height:100px; background-color:#900; float:left;}
.two{background-color:#0F0;}
.three{width:200px; height:120px; background-color:#00F;}
</style>
</head>
<body>
<div class="one">
</div>
<div class="two">
</div>
<div class="three"></div>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>导航栏</title>
<style type="text/css">
*{margin:0; padding:0;}
body{font-size:14px; color:#3c3c3c;}
a{color:#3c3c3c; text-decoration:none;}
ul{list-style:none; margin:50px auto; width:660px;}
ul li{float:left; width:110px; height:42px;}
ul li a{ display:block; width:110px; height:42px; text-align:center; line-height:42px;}
ul li a:hover{background-color:red;}
</style>
</head>
<body>
<ul>
    <li><a href="#">网址大全</a></li>
    <li><a href="#">电视剧</a></li>
    <li><a href="#">最新电影</a></li>
    <li><a href="#">网址大全</a></li>
    <li><a href="#">热门游戏</a></li>
    <li><a href="#">小游戏</a></li>
</ul>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>导航栏</title>
<style type="text/css">
*{margin:0; padding:0;}
body{font-size:12px; color:#3c3c3c; font-family:"微软雅黑"}
a{color:#3c3c3c; text-decoration:none;}
.box{width:500px; height:300px; border:1px solid #093; margin:50px auto;}
.box ul{list-style:none; margin:30px 10px;}
.box ul li{float:left; width:80px; height:40px; text-align:center; line-height:40px;} 
</style>
</head>
<body>
<div class="box">
    <ul>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
        <li><a href="#">百度一下</a></li>
    </ul>
</div>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>auto</title>
<style type="text/css">
.box{width:800px; border:1px solid #f00; margin:0 auto;}
.in{width:200px; height:200px; background-color:#F00; margin-left:auto;}
</style>
</head>
<body>
<div class="box">
    <div class="in"></div>
</div>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>一列固定宽度且居中</title>
<style type="text/css">
body,div,ul,li,ol,h1,h2,h3,h4,h5,input,textarea,p{margin:0; padding:0;}
body{font-size:14px; color:#3c3c3c; font-family:Arial, Helvetica, sans-serif;}
a{text-decoration:none; color:#3c3c3c;}
a:hover{color:#f00; text-decoration:underline;}
.top{width:1180px; height:80px; background-color:#F00; margin:0 auto;}
.nav{width:1180px; height:35px; background-color:#0F0; margin:0 auto;}
.banner{width:100%; height:300px; background-color:#00F;} 
.main{width:1180px; height:500px; background-color:#FF0; margin:0 auto;}
.footer{width:1180px; height:120px; background-color:#0FF; margin:0 auto;}
</style>
</head>
<body>
<div class="top"></div>
<div class="nav"></div>
<div class="banner"></div>
<div class="main"></div>
<div class="footer"></div>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>两列固定宽度</title>
<style type="text/css">
body,div,ul,li,ol,h1,h2,h3,h4,h5,input,textarea,p{margin:0; padding:0;}
body{font-size:14px; color:#3c3c3c; font-family:Arial, Helvetica, sans-serif;}
a{text-decoration:none; color:#3c3c3c;}
a:hover{color:#f00; text-decoration:underline;}
#top,#nav,#banner,#main,#footer{width:1000px;  margin:1px auto;}
#top{height:80px; background-color:#F00;}
#nav{height:35px; background-color:#0f0;}
#banner{height:150px; background-color:#00F;}
.left{width:300px; height:500px; background-color:#099; float:left; }
.right{width:699px; height:500px; background-color:#396; float:right;}
</style>
</head>
<body>
<div id="top"></div>
<div id="nav"></div>
<div id="banner"></div>
<div id="main">
    <div class="left"></div>
    <div class="right"></div>
</div>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>浮动</title>
<style type="text/css">
body,div,ul,li,ol,h1,h2,h3,h4,h5,input,textarea,p{margin:0; padding:0;}
body{font-size:14px; color:#3c3c3c; font-family:Arial, Helvetica, sans-serif;}
a{text-decoration:none; color:#690;}
a:hover{color:#fff; text-decoration:none;}
ul{list-style:none;}
.banner{width:760px; height:150px; margin:0 auto; background-image:url(banner_bg.jpg);}
.nav{height:32px; width:760px; margin:0 auto; background-image:url(button1_bg.jpg);}
.nav li{float:left; width:80px; height:32px; background:url(button1.jpg) no-repeat;}
.nav a{display:block; width:80px; height:32px; text-align:center; line-height:32px;}
.nav a:hover{background:url(button2.jpg) no-repeat;}
.main{height:500px; background-color:#6C6; width:760px; margin:0 auto;}
</style>
</head>
<body>
<div class="banner">
    <img src="banner1.jpg" width="600" height="150" />
</div>   <!--这是banner部分--> 
<div class="nav">
    <ul>
        <li><a href="#">首页导读</a></li>
        <li><a href="#">首页导读</a></li>
        <li><a href="#">首页导读</a></li>
        <li><a href="#">首页导读</a></li>
        <li><a href="#">首页导读</a></li>
        <li><a href="#">首页导读</a></li>
    </ul>
</div>      <!-- 这是nav 部分 -->
<div class="main">
</div>
</body>
</html>

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原文地址:https://www.cnblogs.com/brittany/p/4833804.html