相对定位
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>相对定位</title>
<style type="text/css">
.box1{
height: 200px;
background-color: red;
position: relative;
}
.box2{
width: 200px;
height: 200px;
background-color: yellow;
position: relative;
left: 100px;
top: 200px;
}
.box3{
width: 200px;
height: 200px;
background-color: yellowgreen;
}
.s1{
position: relative;
width: 200px;
height: 200px;
background-color: yellow;
}
</style>
</head>
<body>
<div class="box1"></div>
<div class="box2"></div>
<div class="box3"></div>
<span class="s1">我是一个span</span>
</body>
</html>
绝对定位
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>绝对定位</title>
<style type="text/css">
.box1{
width: 200px;
height: 200px;
background-color: red;
}
.box2{
width: 200px;
height: 200px;
background-color: yellow;
position: absolute;
}
.box3{
width: 300px;
height: 300px;
background-color: yellowgreen;
}
.box4{
width: 300px;
height: 300px;
background-color: orange;
}
.s1{
width: 100px;
height: 100px;
background-color: yellow;
position: absolute;
}
</style>
</head>
<body>
<div class="box1"></div>
<div class="box5">
<div class="box4">
<div class="box2"></div>
</div>
</div>
<div class="box3"></div>
<span class="s1">我是一个span</span>
</body>
</html>
固定定位
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>固定定位</title>
<style type="text/css">
.box1{
width: 200px;
height: 200px;
background-color: red;
}
.box2{
width: 200px;
height: 200px;
background-color: yellow;
position: fixed;
left: 0px;
top: 0px;
}
.box3{
width: 200px;
height: 200px;
background-color: yellowgreen;
}
</style>
</head>
<body style="height: 5000px;">
<div class="box1"></div>
<div class="box4" style="width: 300px; height: 300px; background-color: orange; position: relative;">
<div class="box2"></div>
</div>
<div class="box3"></div>
</body>
开班信息
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>开班信息</title>
<style type="text/css">
/*清除默认样式*/
*{
margin: 0;
padding: 0;
}
/*统一页面中的字体*/
body{
font: 12px/1 宋体;
}
/*设置outer的大小*/
.outer{
width: 300px;
/*height: 473px;*/
/*background-color: #bfa;*/
/*设置outer居中效果*/
margin: 50px auto;
}
/*设置title的边框*/
.title{
/*设置上边框*/
border-top: 2px #019e8b solid;
/*设置盒子的高度*/
height: 36px;
/*设置背景样式*/
background-color: #f5f5f5;
/*设置title的行高*/
line-height: 36px;
/*设置title的内边距*/
padding: 0px 22px 0px 16px;
}
/*设置title中的超链接*/
.title a{
float: right;
/*设置字体颜色*/
color: red;
}
/*设置h3*/
.title h3{
font: 16px/36px "微软雅黑";
}
/*设置内容*/
.content{
border: 1px solid #deddd9;
/*设置内边距*/
padding: 0px 28px 0px 20px;
}
/*设置内容中的超链接*/
.content a{
color: black;
text-decoration: none;
/*设置字体大小*/
font-size: 12px;
}
/*为超链接添加一个hover伪类*/
.content a:hover{
color: red;
/*为超链接添加下划线*/
text-decoration: underline;
}
/*设置内容中的标题*/
.content h3{
margin-top: 14px;
margin-bottom: 16px;
}
/*设置右侧a的样式*/
.content .right{
/*设置向右浮动*/
float: right;
}
/*设置ul的样式*/
.content ul{
/*去除项目符号*/
list-style: none;
/*为ul设置一个下边框*/
border-bottom: 1px dashed #deddd9;
}
/*取消最后一个ul的边框*/
.content .no-border{
border: none;
}
/*设置内容中的红色字体*/
.content .redfont{
color: red;
font-weight: bold;
}
/*设置内容中的li*/
.content li{
margin-bottom: 15px;
}
</style>
</head>
<body>
<!-- 创建一个外层div，容纳整个内容 -->
<div class="outer">
<!-- 开班信息的头部 -->
<div class="title">
<a href="#">18年面授开班计划</a>
<h3>近期开班</h3>
</div>
<!-- 开班信息的主要内容 -->
<div class="content">
<h3><a href="#">人工智能+Python-高薪就业班</a></h3>
<ul>
<li>
<a class="right" href="#"><span class="redfont">预约报名</span></a>
<a href="#">开班时间：<span class="redfont">2018-04-26</span></a>
</li>
<li>
<a class="right" href="#"><span class="redfont">无座，名额爆满</span></a>
<a href="#">开班时间：<span class="redfont">2018-03-23</span></a>
</li>
<li>
<a class="right" href="#"><span>开班盛况</span></a>
<a href="#">开班时间：<span>2018-01-23</span></a>
</li>
<li>
<a class="right" href="#"><span>开班盛况</span></a>
<a href="#">开班时间：<span>2017-12-20</span></a>
</li>
<li>
<a class="right" href="#"><span>开班盛况</span></a>
<a href="#">开班时间：<span>2017-11-18</span></a>
</li>
</ul>
<h3><a href="#">Android开发+测试-高薪就业班</a></h3>
<ul>
<li>
<a class="right" href="#"><span class="redfont">预约报名</span></a>
<a href="#">开班时间：<span class="redfont">2018-04-26</span></a>
</li>
<li>
<a class="right" href="#"><span>开班盛况</span></a>
<a href="#">开班时间：<span>2018-03-23</span></a>
</li>
<li>
<a class="right" href="#"><span>开班盛况</span></a>
<a href="#">开班时间：<span>2018-01-23</span></a>
</li>
<li>
<a class="right" href="#"><span>开班盛况</span></a>
<a href="#">开班时间：<span>2017-12-20</span></a>
</li>
</ul>
<h3><a href="#">大数据软件开发-青芒工作室</a></h3>
<ul class="no-border">
<li>
<a class="right" href="#"><span class="redfont">预约报名</span></a>
<a href="#">开班时间：<span class="redfont">2018-04-26</span></a>
</li>
<li>
<a class="right" href="#"><span>开班盛况</span></a>
<a href="#">开班时间：<span>2018-01-23</span></a>
</li>
</ul>
</div>
</div>
</body>
</html>