源代码如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=, initial-scale=1.0">
<title>立即注册</title>
<style>
button{
width: 200px;
height: 40px;
background-color: red;
color: white;
/* border: none; */
}
</style>
</head>
<body>
<button>立即注册</button>
</body>
</html>效果如下图：
