为什么我这个HTML没颜色了?

<!DOCTYPE HTML>
<html>
  <head>
    <title>注册页面</title>
    <meta charset='utf-8'>
    <style>
    /*
      .sheet{width:300px;margin:30px auto;}
      .label{width:40px;}
      .input{width:160;}
    </style>
  </head>
  <body>
    <form action='zhuce.php' method='post'>
      <h1>欢迎注册</h1>

      <label>用户名:</label><input type='text' name='zh'><br/>
      <label>密&nbsp;码:</label><input type='password' name='mm'><br/>
      <label>邮&nbsp;箱:</label><input type='sheet' name='email'><br/>
      <div style="width:100px; margin:0 auto; text-align:left;"><input type='submit' value='注册'></div>
          <div>如果已有账号,请<a href="./login.php">登陆</a></div>
    </form>
  </body>
</html>

 

哪里没颜色了?

1.注释怎么没有结束的*/ 

<!DOCTYPE HTML>
<html>
  <head>
    <title>注册页面</title>
    <meta charset='utf-8'>
    <style>
    /*
      .sheet{width:300px;margin:30px auto;}
      .label{width:40px;}
      .input{width:160;}
      */
    </style>
  </head>
  <body>
    <form action='zhuce.php' method='post'>
      <h1>欢迎注册</h1>

      <label>用户名:</label><input type='text' name='zh'><br/>
      <label>密&nbsp;码:</label><input type='password' name='mm'><br/>
      <label>邮&nbsp;箱:</label><input type='sheet' name='email'><br/>
      <div style="width:100px; margin:0 auto; text-align:left;"><input type='submit' value='注册'></div>
          <div>如果已有账号,请<a href="./login.php">登陆</a></div>
    </form>
  </body>
</html>