as shown in the question
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
ul,li{
margin:0;
padding:0;
}
li{
list-style:none;
border:1px solid -sharpccc;
padding:20px 10px;
margin-bottom:20px;
}
input{
display:block;
margin:0 auto;
width:100px;
height:50px;
}
</style>
</head>
<body>
<ul>
<li>1</li>
<li>2</li>
</ul>
<input type="button" id="" value="" />
</body>
</html>