<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
<title></title>
<style>
* {
margin: 0;
padding: 0;
}
input {
-webkit-box-sizing: border-box;
box-sizing: border-box;
width: 100%;
padding: 10px;
border: 1px solid #DDD;
}
</style>
</head>
<body>
<input type="text">
</body>
</html>