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CSS -- 未解之疑

@、css那些事儿 -- 第9章 反馈表单

自己编写了CSS,可是红框中的横线比下面的要粗。对比作者的代码,发现可能与上面标题h3的height和line-height有关,但是不知道具体是为什么?

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<!doctype html>
<html lang="en">
 <head>
  <meta charset="UTF-8">
  <meta name="Generator" content="EditPlus?">
  <meta name="Author" content="">
  <meta name="Keywords" content="">
  <meta name="Description" content="">
  <title>Document</title>
  <style type="text/css">
    .feedback {
        width:500px;
    }
    .feedback * {
        margin:0;
        padding:0;
        font:normal 12px/1.5em "宋体", Verdana,Lucida, Arail, Helvetica,sans-serif;
    }
    .feedback h3 {
        padding:1px 10px;
        font-weight:bold;
        color:#FFFFFF;
        background-color:#619FCF;
    }
    .feedback .content {
        padding:10px;
    } 
    .feedback .content fieldset {
        margin-top:10px;
        padding:0 20px;
        border:0 none;
        border-top:1px solid #999999;
    }
    .feedback .content label {
        float:left;
        width:100px;
        text-align:right;
        color:#AAAAAA;
    }
    .feedback .content .frm_cont {
        margin-top:10px;
    }
    .feedback .content .email input {
        width:200px;
    }
    .feedback .content .url input {
        width:300px;
    }
    .feedback .content .up_file input {
        width:300px;
    }
    .tips {
        margin-left:100px;
    }
    /* .btns {
        float:left;
        margin:0 auto;
    } */
  </style>
 </head>
 <body>
    <div id="" class="feedback">
        <h3>反馈表单</h3>
        <div id="" class="content">
            <form method="post" action="">
                <fieldset class="base_info">
                    <legend>用户信息</legend>
                    <div id="" class="frm_cont userName">
                        <label for="userName">用户名:</label><input type="text" name="" id="userName" />
                    </div>
                    <div id="" class="frm_cont email">
                        <label for="email">电子邮件:</label><input type="text" name="" id="email" value="@" />
                    </div>
                    <div id="" class="frm_cont url">
                        <label for="url">网址:</label><input type="text" name="" id="url" value="http://*" />
                    </div>
                </fieldset>
                <fieldset class="feedback_content">
                    <legend>反馈内容</legend>
                    <div id="" class="frm_cont up_file">
                        <label for="up_file">相关图片:</label><input type="file" id="up_file" />
                        <p class="tips">本系统只支持上传.jpg、.gif、.png图片。</p>
                    </div>
                    <div id="" class="frm_cont msg">
                        <label for="msg">内容:</label><textarea name="" rows="4" cols="40" id="msg"></textarea>
                        <p class="tips">请输入留言内容!</p>
                    </div>
                </fieldset>
                <div id="" class="btns">
                    <button type="submit">提交</button><button type="reset">重置</button>
                </div>
            </form>
        </div>
    </div>
 </body>
</html>
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CSS -- 未解之疑