CSS3之线条特效（鼠标悬停线条从中间变长）
当鼠标悬停在红色圆上时，福字下面出现一条白色的线条从中间不断向两边延伸
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<meta name="Generator" content="EditPlus®">
<meta name="Author" content="">
<meta name="Keywords" content="">
<meta name="Description" content="">
<title>Document</title>
</head>
<body>
<p id="wrap">
<p class="good">福</p>
<p id="line"></p>
</p>
</body>
</html>
#wrap {
width: 500px;
height: 500px;
border-radius: 50%;
background-color: #E4393C;
margin: 100px auto;
position: relative;
}
#wrap:befor {
content: "";
display: table;
}
p.good {
float: left;
font-size: 168px;
font-family: "楷体";
color: #fff;
margin: 148px 0 0 166px;
}
#line {
width: 0px;
height: 5px;
border-radius: 5px;
background-color: #fff;
margin: 0 auto;
position: absolute;
top: 338px;
left: 0px;
right: 0px;
transition: width 1s linear;
}
#wrap:hover #line {
width: 200px;
}