title: How can I change value from property in jQuery
body: <p>I am trying to select property "top" and the value minus (-200px) from inline css.</p>
  
  <pre><code>&lt;article class="stack" style="position: absolute; left: 741px; top: 1000px;"&gt;
  &lt;/article&gt;
  </code></pre>
  
  <p>What I want is to count the top: 1000px - 200px</p>
  
  <p>It should decrease the move of the article from 1000px to 800px.</p>
  
  <p>Thanks in advance for any help and sorry if the question is badly asked.</p>