<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>自定义input[type='file']样式</title>
</head>
<body>
<input type="file"/>
<style type="text/css">
input{
width: 20px;
height: 20px;
cursor: pointer;
}
input:before{
content: "";
display: inherit;
width: inherit;
height: inherit;
}
</style>
</body>
</html>