Ps: 1.标准流 2.浮动 3.定位 CCS重点
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
div {
width: 200px;
height: 200px;
background-color: pink; }
.top { position: relative;
top: 100px;
left: 100px;
}
.bottom {
background-color: purple;
}
</style>
</head>
<body>
<div class="top"></div>
<div class="bottom"></div>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
body {
height: 2000px;
}
div {
width: 100px;
height: 100px;
background-color: pink;
/*position: absolute;
top: 10px;
left: 10px;*/
}
.top {
position: absolute; /*不占位置 跟浮动一样*/
right: 0;
bottom: 0; }
.bottom {
background-color: purple;
width: 110px;
}
</style>
</head>
<body>
<div class="top"></div>
<div class="bottom"></div>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
.father {
width: 500px;
height: 500px;
background-color: pink;
margin: 100px;
}
.son {
width: 200px;
height: 200px;
background-color: purple;
position: absolute;
top: 50px;
left: 50px;
/*若所有父元素都没有定位，以浏览器当前屏幕为准对齐(document文档)。*/
}
</style>
</head>
<body>
<div class="father">
<div class="son"></div>
</div>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
.yeye {
width: 800px;
height: 800px;
background-color: skyblue;
position: absolute;
}
.father {
width: 500px;
height: 500px;
background-color: pink;
margin: 100px;
/*position: absolute;*/
}
.son {
width: 200px;
height: 200px;
background-color: purple;
position: absolute;
top: 50px;
left: 50px;
/*若所有父元素都没有定位，以浏览器当前屏幕为准对齐(document文档)。*/
}
</style>
</head>
<body>
<div class="yeye">
<div class="father">
<div class="son"></div>
</div>
</div> </body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
div {
width: 310px;
height: 190px;
border: 1px solid #ccc;
margin: 100px auto;
padding: 10px;
position: relative;
}
.top {
position: absolute;
top: 0;
left: 0;
} .bottom {
position: absolute;
right: 0;
bottom: 0;
} </style>
</head>
<body>
<div>
<img src="data:images/top_tu.gif" alt="" class="top">
<img src="data:images/br.gif" alt="" class="bottom">
<img src="data:images/adv.jpg" height="190" width="310" alt="">
</div>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
div {
width: 200px;
height: 200px;
background-color: pink;
/*margin: 100px auto;*/
/*float: left;*/
position: absolute;
/*加了定位 浮动的的盒子 margin 0 auto 失效了*/
left: 50%;
margin-left: -100px;
top: 50%;
margin-top: -100px;
}
</style>
</head>
<body>
<div></div>
</body>
</html>
--顺丰模板-----------------------------------------------
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
}
.sf {
width: 1259px;
height: 472px;
margin: 100px auto;
position: relative;
}
.nav {
width: 960px;
height: 80px;
background-color: #000;
position: absolute; /*只有绝对定位才可以，不占位置压着别人； 下面的三行是为了居中*/
bottom: 0;
left: 50%;
margin-left: -480px;
}
.nav li {
float: left;/*浮动是为了排成一行*/
width: 160px;
height: 80px;
}
.nav li a {
width: 160px;
height: 80px;
display: block;
text-align: center;
line-height: 80px;
color: #fff;
text-decoration: none;
}
.nav li a:hover {
background-color: #fff;
color: #000;
}
</style>
</head>
<body>
<div class="sf">
<a href="#">
<img src="data:images/sf.png" height="472" width="1259" alt="">
</a>
<div class="nav">
<ul>
<li><a href="#">快递查询</a></li>
<li><a href="#">快递查询</a></li>
<li><a href="#">快递查询</a></li>
<li><a href="#">快递查询</a></li>
<li><a href="#">快递查询</a></li>
<li><a href="#">快递查询</a></li>
</ul>
</div>
</div>
</body>
</html>
----------------------------------淘宝轮播图案例
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
}
li {
list-style: none;
}
.tb {
width: 520px;
height: 280px;
background-color: pink;
margin: 100px auto;/*居中*/
position: relative;/*相对*/
}
.tb a {
width: 24px;
height: 36px; display: block;
position: absolute;
top: 50%;/*到中间去*/
margin-top: -18px;
}
.left {
left: 0;/*到最左*/
background: url(images/left.png) no-repeat;
}
.right {
right: 0;
background: url(images/right.png) no-repeat;
}
.tb ul {
width: 70px;
height: 13px;
background: rgba(255, 255, 255, .3);
position: absolute; /* 加定位*/
bottom: 18px;
/**居中*/
left: 50%; /*水平走父容器的一半*/
margin-left: -35px; /*左走自己的一半*/
border-radius: 8px;
}
.tb ul li {
width: 8px;
height: 8px;
background-color: #fff;
float: left; /*排成一行*/
margin: 3px;
border-radius: 50%;
}
.tb .current {
background-color: #f40;
}
</style>
</head>
<body>
<div class="tb">
<img src="data:images/tb.jpg" >
<a href="#" class="left"></a>
<a href="#" class="right"></a>
<ul>
<li class="current"></li>
<li></li>
<li></li>
<li></li>
<li></li>
</ul> </div>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
.father {
width: 500px;
height: 500px;
background-color: purple;
margin: 100px;
position: relative;
}
.ad {
width: 200px;
height: 200px;
background-color: pink;
position: fixed; /*固定定位*/
left: 0;
top: 100px;
}
</style>
</head>
<body>
<div class="father">
<div class="ad">ad</div>
</div>
<p>我是文字</p>
<p>我是文字</p>
<p>我是文字</p>
<p>我是文字</p>
<p>我是文字</p>
<p>我是文字</p>
<p>我是文字</p>
<p>我是文字</p>
<p>我是文字</p>
<p>我是文字</p>
<p>我是文字</p>
<p>我是文字</p>
<p>我是文字</p>
<p>我是文字</p>
<p>我是文字</p>
<p>我是文字</p>
<p>我是文字</p>
<p>我是文字</p>
<p>我是文字</p>
<p>我是文字</p>
<p>我是文字</p>
<p>我是文字</p>
<p>我是文字</p>
<p>我是文字</p>
<p>我是文字</p>
<p>我是文字</p>
<p>我是文字</p>
<p>我是文字</p>
<p>我是文字</p>
<p>我是文字</p>
<p>我是文字</p>
</body>
</html>
------------------------------------------------------------
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
div {
height: 100px;
background-color: pink;
/*float: left; 模式转换 inline-block */
position: fixed; /*绝对定位 he 固定定位模式转换 */
width: 100%;
top: 0;
left: 0;
}
</style>
</head>
<body>
<div></div>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
div {
width: 200px;
height: 200px;
background-color: red;
position: absolute;
/*z-index: 0; 只有定位的盒子才有*/
}
.red {
z-index: 1;
}
.blue {
background-color: blue;
left: 50px;
top: 50px;
z-index: 2;
}
.green {
background-color: green;
left: 100px;
top: 100px;
z-index: 999;
}
</style>
</head>
<body>
<div class="red"></div>
<div class="blue"></div>
<div class="green"></div>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
div {
width: 250px;
height: 400px;
border: 1px solid #ccc;
float: left;
margin-left: -1px;/*这样就压着了，会避免两个重叠的时候，很粗*/
position: relative;
/*z-index: 0;*/
}
div:hover {
border: 1px solid #f40;
/*position: relative; 相对定位比标准流高一级 浮在上面的*/
z-index: 1;
/*可以通过relative和z-index实现提升层*/
}
</style>
</head>
<body>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
</body>
</html>
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
div {
width: 200px;
height: 200px;
background-color: pink;
/*display: 显示*/
/*display: none; 隐藏某个元素 == display: block 显示某个元素 不保留位置*/
/*visibility: visible; 显示某个元素*/
visibility: hidden; /*隐藏某个元素 保留位置的！！！！！！！！！！！！！！！！！ */
}
p {
width: 200px;
height: 400px;
background-color: purple;
}
</style>
</head>
<body>
<div></div>
<p>放个屁</p>
</body>
</html>
PS: 经过显示播放的例子
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
a {
display: block;
width: 448px;
height: 252px;
margin: 100px;
position: relative;
}
.mask {
width: 100%;
height: 100%;
background:rgba(0, 0, 0, .4) url(images/arr.png) no-repeat center;
position: absolute;
top: 0;
left: 0;
display: none; /* 首先正常情况下 是隐藏的*/
} /*什么时候出来？ 鼠标放到 a 身上 是a 里面的 mask 出来*/
a:hover .mask { /*：hover 鼠标经过a 然后 a 里面的 mask 就显示出来 所以这里用 后代选择器*/
display: block; /*显示出来*/
} </style>
</head>
<body>
<a href="#">
<img src="data:images/tudou.jpg" height="252" width="448" alt="">
<div class="mask"></div>
</a>
<a href="#">
<img src="data:images/tudou.jpg" height="252" width="448" alt="">
<div class="mask"></div>
</a>
<a href="#">
<img src="data:images/tudou.jpg" height="252" width="448" alt="">
<div class="mask"></div>
</a>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
li {
/*cursor: pointer; 让我们的鼠标样式变成小手*/
/*cursor: text; 让我们的鼠标样式变成选择*/
cursor: default; /* 让我们的鼠标样式小白*/
}
p {
width: 100px;
height: 100px;
background-color: pink;
cursor: move; /*鼠标变成十字架样子*/
}
</style>
</head>
<body>
<ul>
<li>文字效果</li>
<li>文字效果</li>
<li>文字效果</li>
<li>文字效果</li>
<li>文字效果</li>
<li>文字效果</li>
</ul>
<p></p>
<ul>
<li style="cursor:default">我是小白</li>
<li style="cursor:pointer">我是小手</li>
<li style="cursor:move">我是移动</li>
<li style="cursor:text">我是文本</li>
</ul>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
input {
outline: none; /*取消轮廓线的做法，下面是为了统一其他的浏览器显示状态*/
border: 1px solid #ccc;
width: 200px;
height: 25px;
background: url(images/s.png) no-repeat 180px center;
}
textarea {
resize: none; /*防止拖拽*/
outline: none; /*取消蓝色边框*/
}
</style>
</head>
<body>
<input type="text">
<textarea name="" id="" cols="30" rows="10"></textarea>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
img {
/*vertical-align: middle;*/ 让字和图片防止有多余的白边
display: block;
}
div {
border: 2px solid red;
}
</style>
</head>
<body>
<div>
<img src="data:images/tudou.jpg" height="252" width="448" alt="">
<!-- my name is 强哥 -->
</div>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
}
body {
padding: 30px;
}
li {
list-style: none;
width: 200px;
height: 30px;
border: 1px solid pink;
white-space: nowrap;/*强制一行显示*//*1.强制在同一行内显示所有文本，直到文本结束或者遭遇br标签对象才换行*/
overflow: hidden; /* 2. 超出的部分 隐藏*/
text-overflow: ellipsis; /* 3. 溢出的部分用省略号替代*/
line-height: 30px;
}
</style>
</head>
<body>
<ul>
<li>文字内容文字内容文字内容文字内容文字内容</li>
<li>文字内容文字内容文字内容文字内容文字内容</li>
<li>文字内容文字内容文字内容文字内容文字内容</li>
<li>文字内容文字内容文字内容文字内容文字内容</li>
<li>文字内容文字内容文字内容文字内容文字内容</li>
</ul>
</body>
</html>
PS: 说白了 ，就是一张图的不同位置显示
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
h3 {
background: url(images/index.png) no-repeat -2px -184px;
width: 26px;
height: 26px;
}
div {
width: 236px;
height: 106px;
background: url(images/index.png) no-repeat 0 -350px;
}
</style>
</head>
<body>
<h3></h3>
<div></div>
</body>
</html>PS:自定义自己的名字
PS:起就是就是动态增长，也是一张图的来回应用，只是一种形式
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
a {
margin: 100px;
height: 33px;
display: inline-block;
background: url(images/to.png) no-repeat;
color: #fff;
text-decoration: none;
line-height: 33px;/*居中对齐*/
padding-left: 15px;
}
span {
display: inline-block;
height: 33px;
background: url(images/to.png) no-repeat right;
padding-right: 15px;
}
</style>
</head>
<body>
<a href="#">
<span>首页</span>
</a>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
@font-face { /*声明字体 引用字体*/
font-family: "icomoon"; /*我们自己起名字可以*/
src: url('fonts/icomoon.eot?7kkyc2');
src: url('fonts/icomoon.eot?7kkyc2#iefix') format('embedded-opentype'),
url('fonts/icomoon.ttf?7kkyc2') format('truetype'),
url('fonts/icomoon.woff?7kkyc2') format('woff'),
url('fonts/icomoon.svg?7kkyc2#icomoon') format('svg');
font-style: normal; /*倾斜字体正常*/
}
span, em {
font-family: "icomoon";
font-size: 100px;
color: pink;
font-style: normal;
}
.car {
font-family: "icomoon";
}
/*京东 CSSRESET css 初始化*/
/* *{margin:0;padding:0}
em,i{font-style:normal}
li{list-style:none}
img{border:0;vertical-align:middle}
button{cursor:pointer}
a{color:#666;text-decoration:none}
a:hover{color:#c81623}
button,input{font-family:Microsoft YaHei,tahoma,arial,Hiragino Sans GB,\\5b8b\4f53,sans-serif} body{
background-color:#fff;font:12px/1.5 Microsoft YaHei,tahoma,arial,Hiragino Sans GB,\\5b8b\4f53,sans-serif;color:#666}
.hide,.none{display:none} .clearfix:after{visibility:hidden;clear:both;display:block;content:".";height:0}.clearfix{*zoom:1}*/ </style>
</head>
<body> <div>行高不带单位</div>
<span></span>
<em></em>
<div class="car"></div>
<button>123</button>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>京东(JD.COM)-正品低价、品质保障、配送及时、轻松购物！</title>
<meta name="description" content="京东JD.COM-专业的综合网上购物商城,销售家电、数码通讯、电脑、家居百货、服装服饰、母婴、图书、食品等数万个品牌优质商品.便捷、诚信的服务，为您提供愉悦的网上购物体验!" />
<meta name="Keywords" content="网上购物,网上商城,手机,笔记本,电脑,MP3,CD,VCD,DV,相机,数码,配件,手表,存储卡,京东" />
<link rel="shortcut icon" href="favicon.ico" type="image/x-icon"/><!-- 浏览器边上的图标 -->
<!-- normalize 里面css 初始化 针对浏览器 -->
<link rel="stylesheet" href="css/normalize.css" />
<!-- base 里面只写公共样式 是对京东网页 头部和底部样式 -->
<link rel="stylesheet" href="css/base.css" />
<!-- 京东首页的css 只写首页的 独有的-->
<link rel="stylesheet" href="css/index.css">
</head>
<body>
<!-- 京东顶部开始，因为这有个关闭按钮，所以叫jenvent -->
<div class="J_event">
<a href="#" class="w">
<i></i>
</a>
</div>
<!-- 京东顶部结束 -->
<!-- 快捷导航模块制作开始 -->
<div class="shortcut">
<div class="w">
<ul class="fl">
<li>
<i class="pos"></i>
北京
</li>
</ul>
<ul class="fr">
<li>
<a href="#">
你好，请登录
</a>
<a href="#" class="style-red">
免费注册
</a>
</li>
<li class="spacer"></li>
<li>
<a href="#">
我的订单
</a>
</li>
<li class="spacer"></li>
<li class="dropdown">
<a href="#">
我的京东
</a>
<i></i>
</li>
<li class="spacer"></li>
<li>
<a href="#">
京东会员
</a>
</li>
<li class="spacer"></li>
<li>
<a href="#">
企业采购
</a>
</li>
<li class="spacer"></li>
<li class="dropdown">
<a href="#">
客户服务
</a>
<i></i>
</li>
<li class="spacer"></li>
<li class="dropdown">
<a href="#">
网站导航
</a>
<i></i>
</li>
<li class="spacer"></li>
<li style="position: relative; z-index: 1;">
<a href="#">
手机京东
</a>
<div class="erweima">
<img src="data:images/erweima.png" alt="">
</div>
</li>
</ul>
</div>
</div>
<!-- 快捷导航模块制作结束 -->
<!-- header 部分 start -->
<div class="header">
<div class="w inner">
<!-- logo 部分 -->
<div class="logo">
<h1>
<a href="#" title="京东网">京东</a>
</h1>
</div>
<!-- 搜索部分 -->
<div class="search">
<input type="text" value="单反相机">
<button>
<i></i>
</button>
<em></em>
</div>
<!-- 热词部分 -->
<div class="hotwords">
<a href="#" class="style-red">学生专享</a>
<a href="#">300减160</a>
<a href="#">七折返场</a>
<a href="#">骑行运动</a>
<a href="#">家电榜单</a>
<a href="#">无损播放器</a>
<a href="#">汽车脚垫</a>
<a href="#">巧克力</a>
<a href="#">铝合金门窗</a>
</div>
<!-- 购物车 -->
<div class="myCar">
<i></i>
<a href="#">我的购物车</a>
<s>0</s>
</div>
<!-- 电脑 -->
<div class="computer">
<a href="#">
<img src="data:images/computer.jpg" height="40" width="190" alt="">
</a>
</div>
</div>
</div>
<!-- header 部分 end--> </body>
</html>
/*
* @Author: andy
* @Date: 2017-12-13 11:19:05
* @Last Modified by: andy
* @Last Modified time: 2017-12-13 11:19:05
PS:这里只写公共样式;
*/
/* 版心 */
.w {
width: 1190px;
margin: auto;
}
.fr {
float: right;
}
.fl {
float: left;
}
.style-red {
color: #f10215!important;
}
li {
list-style: none;
}
ul {
margin: 0;
padding: 0;
}
input, button {
padding: 0;
border: 0;
}
a {
text-decoration: none;
}
@font-face {
font-family: 'icomoon';
src: url('../fonts/icomoon.eot?axvffw');
src: url('../fonts/icomoon.eot?axvffw#iefix') format('embedded-opentype'),
url('../fonts/icomoon.ttf?axvffw') format('truetype'),
url('../fonts/icomoon.woff?axvffw') format('woff'),
url('../fonts/icomoon.svg?axvffw#icomoon') format('svg');
font-weight: normal;
font-style: normal;
}
body {
background-color: #F6F6F6;
}
/* 京东 顶部 start */
.J_event {
background-color: #000;
}
.J_event a {/*就是那个图片链接*/
display: block;
height: 80px;
background: url(../images/top.jpg) no-repeat;
position: relative;
}
.J_event a i {/*就是那个 x 号*/
width: 20px;
height: 20px;
/* background-color: pink; */
position: absolute;
right: 0;
top: 5px;
font-family: "icomoon";
font-style: normal;
text-align: center;
line-height: 20px;
color: #fff;
background: rgba(0,0,0,0.4);
}
/* 京东 顶部 end */ .shortcut {
height: 30px;
line-height: 30px;/*垂直居中*/
background-color: #E3E4E5;
border-bottom: 1px solid #DDDDDD;
color: #9D9D9D;
font-size: 12px;
}
.shortcut a {
color: #9D9D9D;
font-size: 12px;
text-decoration: none;
}
.shortcut a:hover {
color: #c81623;
}
.pos {
font-family: "icomoon";
font-style: normal;
font-size: 14px;
color: #f10215;
}
.shortcut .fl li {
margin-left: 200px;
height: 30px;
overflow: hidden;
}
.shortcut .fr li {
float: left;
}
.spacer {/*快捷方式的小竖线，用li实现*/
width: 1px;
height: 10px;
background-color: #ccc;
margin: 10px 10px 0;
}
.dropdown {/*我的京东V*/
padding-right: 15px;
position: relative;
}
.dropdown i {
font-family: "icomoon";
font-style: normal;
font-size: 16px;
position: absolute;
right: -2px;
top: -2px;
}
.erweima {
width: 60px;
height: 60px;
border: 1px solid #ccc;
padding: 3px;
position: absolute;
left: -8px;
top: 35px;
}
/* header 部分 start */
.header {
height: 140px;
}
.inner {
height: 140px;
background-color: pink;
position: relative;
}
/* header 部分 end */
.logo {
width: 190px;
height: 170px;
position: absolute;
top: -30px;
left: 0;
background-color: purple;
box-shadow: 0 -12px 10px rgba(0,0,0,.2);
}
.logo h1 {
margin: 0;
}
.logo a {
display: block;
width: 190px;
height: 170px;
background: url(../images/logo.jpg) no-repeat;
text-indent: -99999px;/*让logo h1 文字消失*/
overflow: hidden;
}
.search {
width: 550px;
height: 35px;
position: absolute;
top: 25px;
left: 320px;
}
.search input {
width: 493px;
height: 33px;
border: 1px solid #F10215;
padding-left: 5px;
outline: none; /* 取消蓝色边框 */
color: #989898;
float: left;
}
.search button {
width: 50px;
height: 35px;
background-color: #F10215;
float: left;
cursor: pointer; /* 鼠标变成小手 */
outline: none;
}
.search i {
font-family: "icomoon";
color: #fff;
font-style: normal;
font-size: 16px;
}
.search em {
position: absolute;
top: 10px;
right: 65px;
width: 19px;
height: 15px;
cursor: pointer;
background: url(../images/sprite-search.png) no-repeat;
}
.search em:hover {
background-position: -30px 0;
} .hotwords {
position: absolute;
top: 70px;
left: 320px;
}
.hotwords a {
color: #9E9B99;
font-size: 12px;
}
.hotwords a:hover {
color: #f10215;
}
.myCar {
width: 188px;
height: 33px;
border: 1px solid #ccc;
position: absolute;
top: 25px;
right: 100px;
text-align: center;
line-height: 33px;
}
.myCar a {
font-size: 12px;
color: #f10215; }
.myCar i {
font-family: "icomoon";
font-style: normal;
color: #f10215;
margin-right: 3px;
}
.myCar s {
position: absolute;
top: 5px;
left: 140px;
text-decoration: none;
background-color: #f10215;
height: 16px;
line-height: 16px;
font-size: 12px;
padding: 0 3px;
border-radius: 7px;
color: #fff;
}
.computer {
position: absolute;
right: 0;
bottom: 10px;
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
fieldset {
width: 300px;
}
</style>
</head>
<body>
<input type="text" value="请输入明星" list="star"/>
<datalist id="star">
<option value="刘德华">刘德华</option>
<option value="刘若英">刘若英</option>
<option value="刘晓庆">刘晓庆</option>
<option value="戚薇">戚薇</option>
<option value="戚继光">戚继光</option>
</datalist>
<fieldset>
<legend>用户登录</legend>
用户名： <input type="text"> <br>
密码： <input type="password">
</fieldset>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<form action="">
用户名： <input type="text" placeholder="请输入用户名" autofocus> <br />
上传头像： <input type="file" name="" id="" multiple > <br />
昵称： <input type="text" required accesskey="s"> <br /> <input type="submit" value="提交按钮"> </form>
</body>
</html>