title: Where is this CSS style information coming from?
body: <p>I'm trying to fix a CSS stylesheet to make sure that a styled element is shown on the web page.</p>
  
  <p>This is how the CSS stylesheet is linked:</p>
  
  <pre><code>&lt;link rel="stylesheet" href="themes/default/style.css" type="text/css" media="screen" title="" charset="utf-8"/&gt;
  </code></pre>
  
  <p>This is the HTML code:</p>
  
  <pre><code>&lt;a href="search" class="floatleft shadowed"&gt;Advanced Search&lt;/a&gt;
  &lt;a href="post_ad" class="floatright post-ad"&gt;Post an Ad Now&lt;/a&gt;
  </code></pre>
  
  <p>Now when I use the "Inspect Element" tool in Google Chrome and click on the first line, I see this:</p>
  
  <p><img src="https://i.stack.imgur.com/rF7zP.png" alt="working CSS"></p>
  
  <p>The <code>Advanced Search</code> link shows up on the page. No problems there. But if I click on the next line, I see this:</p>
  
  <p><img src="https://i.stack.imgur.com/rswYZ.png" alt="not working CSS"></p>
  
  <p>Because of this, the <code>Post an Ad Now</code> link doesn't show on the page. I don't know where this CSS is coming from and it is certainly not specified in <code>style.css</code> and Google Chrome doesn't show the source (e.g. style.css:101)</p>
  
  <pre><code>.pop-up-ad, .popadtext, .popunder-adv, .popup-ad, .popupAd, .popupAdOuter,
  .popupAdWrapper, .popup_ad, .portalCenterContentAdBottom, .portalCenterContentAdMiddle,
  .portalCenterContentAdTop, .portal_searchresultssponsoredlist, .portalcontentad, .post-ad,
  .post-adsense-bottom, .post-advert, .post-advertisement, .post-googlead, .post-load-ad,
  .post-nativeadcarousel {
      display: none;
  }
  </code></pre>
  
  <p>How can I make sure that the <code>Post an Ad Now</code> link shows on the page?<br>And how do I figure out where the mystery CSS information is coming from?</p>