title: Make Background Black for screen other than popup div
body: <p>I have following div which i am showing as popup:</p>
  
  <pre><code>    &lt;div id="divOperationMessage" style="background-color: White; border: 2px solid black;
              display: block;  width: 350px; z-index: 1001; top: 60px; left: 240px; position: fixed; 
              padding-left: 10px;margin:auto;"&gt;
  
  ------------------Whatever content inside-----------------------------
  
                      &lt;/div&gt;
  </code></pre>
  
  <p>When its shown, i can easily view other part of screen in the main background.</p>
  
  <p>Its viewing as below:</p>
  
  <p><img src="https://i.stack.imgur.com/sb2oh.jpg" alt="enter image description here"></p>
  
  <p>(Entry updated sucessfully is popup div above)</p>
  
  <p>I dont want to show background screen when poup is there.</p>
  
  <p>I want to make it black..</p>
  
  <p>How can i make it black??</p>
  
  <p>I tried with setting opacity to 0.75 ... but that prooved misconceptual...did not solved my purpose..</p>
  
  <p>What can i do for it???</p>
  
  <p>Please help me.</p>