css框架
<div class="contact-r">
<form action="/plus/diy.php" class="contact-form" enctype="multipart/form-data" method="post">
<input type="hidden" name="action" value="post" />
<input type="hidden" name="diyid" value="1" />
<input type="hidden" name="do" value="2" />
<div class="">
<input type="text" class="inp l" name="name" id="name" placeholder="您的姓名">
<input type="text" class="inp r" name="tel" id="tel" placeholder="您的联系方式">
</div>
<textarea cols="30" rows="10" name="nr" id="nr"></textarea>
<input type="hidden" name="dede_fields" value="name,text;tel,text;nr,text" />
<input type="hidden" name="dede_fieldshash" value="1150bc325e255641e2db4115e8c9c51f" />
<input type="submit" value="提交您的需求" class="sub" id="sub">
</form>
</div>
怎么给这段代码加一个css框架,让他居中固定