<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
input {
margin-left: 123px;
}
ul li {
list-style: none;
float: left;
background: red;
width: 30px;
height: 30px;
border-radius: 15px;
margin-right: 10px;
color: #fff;
line-height: 30px;
text-align: center;
}
ul .li1 {
margin-left: -30px;
}
ul .li7 {
background: blue;
}
</style>
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</head>
<body>
<input type="button" value="换一组" id="anniu" />
<ul>
<li class="li1"></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li class="li7"></li>
</ul>
</body>
