标签：
一、理论：二、实践：
1.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style type="text/css">
div{
width : 200px;
margin : 20px auto;
outline : 10px solid #ccc;
padding : 20px
}
</style>
</head>
<body>
<div>快上八个菜</div>
</body>
</html>
2.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style type="text/css">
.form1 textarea{
background:#123586;
resize:none;
}
.form2 textarea{
background:#298529;
resize:both;
}
</style>
</head>
<body>
<form action = "#" method="post" class = "form1">
<textarea name = "test" rows = "15" cols = "20" placeholder="修改文本域大小" ></textarea>
</form>
<form action = "#" method="post" class = "form2">
<textarea name = "test" rows = "15" cols = "20" placeholder="修改文本域大小" ></textarea>
</form>
</body>
</html>
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原文地址：http://blog.csdn.net/bwshqh/article/details/50927670
