html - 更改 Div 上的边距不会影响？

Question

我正在尝试更改页脚边距，使其扩展到网页的宽度，但它似乎仍然受到我添加到 #content 的 50px 左右边距的影响> 部分。我在这里缺少什么属性，以便我可以消除内容边距对页 footer 分的影响？

HTML

<div id="wrapper" />
      <div id="header" />
      <div id="mast"><img src="http://i1256.photobucket.com/albums/ii488/terafanb/guildwars2/26.png" height="99" width="774=" /></div>
      <div id="below-mast" />
      <div id="left" class="column"><img src="http://i157.photobucket.com/albums/t60/Dragon_Aleph/fantasy_warrior_23022-800x600.jpg" height="297" width="226" border="0" alt="Crusader Army" /></div>
      <div id="center" class="column"><img src="http://i157.photobucket.com/albums/t60/Dragon_Aleph/fantasy_warrior_23022-800x600.jpg" height="297" width="400" border="0" alt="Crusader Army" /></div>
      <div id="right" class="column"><img src="http://i157.photobucket.com/albums/t60/Dragon_Aleph/fantasy_warrior_23022-800x600.jpg" height="297" width="139" border="0" alt="Crusader Army" /></div>
      <div></div>
      <div id="content" />
      <p>
      <div class="Heading">Forward Exchange *</div>
      $500.00 - collected upon the closing of the Relinquished Property.
      $500.00 - collected upon closing of each Replacement Property purchased.
      * Special credits may apply - Call Us.<br /></br>
      <div id="we-pay">
        <br />
        <div class="Heading">We pay interest</div>
        </br>
        We provide full disclosure of the fees involved in the transaction in the Exchange Agreement. Our customers are entitled to receive earned interest based on the First National Bank of Durango Investment Money Market rate, from the time when the Relinquished Property funds are initially deposited. Interest does not accrue on those funds withdrawn during the first 30 calendar days after the funds are deposited in the Exchange Trust Account. Also, interest does not accrue if customer elects to have exchange funds held at First National Bank of Durango in an Unlimited FDIC insurance non-interest bearing account (available through December 31, 2012)
      </div>
      <br />
      <div class="Heading">
        Safe-Harbor Reverse Exchange <br />
        <h2>We charge the following fees:</h2>
      </div>
      <div id="prices">$2,500.00 – Title holding fee<br /> 
        $500.00 – LLC fee<br />
        $200.00 – Monthly Rent<br />
        Plus – Forward Exchange fees<br />
        <br />
      </div>
      <div id="note">
        <p>Note: If any improvements need to be made to the parked property,
          being held by the EAT ( Exchange Accommodator Titleholder )
          there will be an additional fee of 1% of the final sales price to Taxpayer.
        </p>
        <div>
          <br /></br>
          <div id="disclaimer">Fees are subject to change without prior notice</p></div>
        </div>
        <div id="footer">
          <a href="index.html">Home</a>
          <strong>l</strong> <a href="whatIs1031.html">What is a 1031 Exchange?</a> <strong>l</strong> <a href="exchangeRequ.html">
          1031 Exchange Requirements</a> <strong>l</strong> <a href="typesOfExchange.html">Types of Exchanges</a> <br />
          <div id="Second-Half">              
            <a href="howToStart.html">How to get Started</a> <strong>l</strong> 
            <a href="whyCLX.html">Why CLX?</a><strong>l</strong> <a href="resources.html">Resources</a> <strong>l</strong> <a href="fAQs.html">FAQs</a> <strong>l</strong> <a href="fees.html">Fees</a> 
            <a href="contactUs.html">Contact Us</a>
          </div>
        </div>
      </div>

CSS

*{box-sizing:border-box;}
#wrapper {margin-left:auto; margin-right:auto;width:774px;}
#below-mast { width:774px; overflow:hidden; }
#left {height:297px; width:29%; margin:4px;margin-left:0px;}
#center{height:297px; width:51%; margin:4px;}
#right {height:297px; width:17%; margin:4px;}
#left,  #center, #right { float:left;margin-bottom:50px;}
#content{overflow:;margin:0px;margin-top:100px;font-family:Arial, Helvetica, sans-serif;margin-right:50px;margin-left:50px;}
.Heading{font-size:19px;font-weight:bold;text-align:center; text-decoration:underline}
.Heading>h2{font-size:13px;text-decoration:none}
#we-pay{font-size:13px}
#we-pay>.Heading{font-size:20px;text-decoration:none;}
#prices{text-align:center; font-size:20px;}
#note{text-align:center;}
#disclaimer{font-size:13px; text-align:center; font-weight:bold;font-style:italic; }
#footer{margin-right:-50px;margin-left:-50px;}
#footer,a:link{font-family:Helvetica, sans-serif;color:#300000; margin-top:50px;}
#Second-Half{margin-left:auto; margin-right:auto;width:450px;}

为了方便起见，这是我在 Code Pen 上的代码的链接 http://codepen.io/Austin-Davis/pen/rLeEi

Answer 1

您的错误可以通过以下代码修复:

#footer { margin: 0; position: absolute; left: 0; width: 100%; }

请结帐:http://codepen.io/joe/pen/uBikf

PS:出于测试目的，我给页脚设置了灰色背景。