1、如何设置边框线
例子：
//HTML
div class="parent center row">
<div></div>
<div></div>
<div></div>
<div></div>
</div>
//CSS
*{
margin:0 ;
padding: 0;
}
.center{
margin-right: auto;
margin-left: auto;
}
.parent{
width: 1240px;
height: 400px;
border: 1px solid #cccccc;
}
.row:after{
content: "";
display: table;
}
.parent>div{
float: left;
width: 25%;
height: 400px;
position: relative;
}
.parent>div:before{
content: "";
display:table;
width: 100%;
height: 100%;
position: absolute;
z-index: 100;
border-right:1px solid #cccccc ;
}
2、如何让背景图片有阴影
例子：
//HTML
<ul class="content">
<li class="one">
[图片上传失败...(image-7ab5f8-1551347033376)]
<a href=""></a>
</li>
//CSS
.sixth ul li{
width: 25%;
height: 200px;
float: left;
box-sizing: border-box;
}
.sixth ul li:not(:first-child){
border-left: 1px solid #999999;
}
.sixth .trend .content>li{
position: relative;
}
.sixth ul li:hover >a {
width: 100%;
height: 100%;
display: block;
position: absolute;
top: 0;
box-shadow: 0 0 20px 2px #e6e6e6 inset;
}
3、如何设置上选框
例子：
简易的：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
*{
margin: 0;
padding: 0;
}
.box{
margin: 100px auto;
width: 80px;
height:30px;
background-color: greenyellow;
box-sizing: border-box;
position: relative;
}
.one{
position: absolute;
width: 80px;
height: 30px;
top: -30px;
background: oldlace;
display: none;
}
.box:hover .one{
display: block;
}
</style>
</head>
<body>
<div class="box">
<p class="one">aaaaa</p>
<p class="two">bbbbb</p>
</div>
</body>
</html>
复杂的：
//HTML
<div class="footer center ">
<div class="box ">
<div class="box-first">
中文
<span></span>
</div>
<div class="box-last">
English
</div>
</div>
</div>
//CSS
.box{
margin-top: 50px;
float: right;
position: relative;
}
.box-first{
width: 110px;
height: 45px;
text-align: center;
line-height: 52px;
background: url("img/language.png") no-repeat 12px 19px;
color: blue;
}
.box-first>span{
width: 0;
height: 0;
border: 4px solid transparent;
border-top-color: black;
position: relative;
top: 10px;right: -5px;
}
.box-last{
width: 110px;
height: 45px;
text-align: center;
line-height: 45px;
box-shadow: 0px 0px 1px 1px #e6e6e6;
position: absolute;
top: -45px;
z-index: 1000;
background: honeydew url("img/language.png") no-repeat 12px -15px;
color: blue;
text-indent: 15px;
display: none;
}
.box:hover>.box-last{
display: block;
border-top-left-radius: 5px;
border-top-right-radius: 5px;
}
.box:hover>.box-first{
border-width: 1px;
border-bottom-left-radius: 5px;
border-bottom-right-radius: 5px;
border-color:#cccccc;
border-style: solid;
}
.box:hover>.box-first>span{
border-bottom-color: black;
border-top-color: transparent;
top: -15px;
}
4、应该运用上的网址
//码云
https://git.oschina.net/
//Ant Design Users
https://github.com/ant-design/ant-design/issues/477
//ICONFONT
http://www.iconfont.cn/
