title: how to stretch my background image to whole screen?
body: <p>I tried several different methods,but unfortunately i could not found the solution
  Here is my page's look
   <a href="http://i.stack.imgur.com/xCAxY.png" rel="nofollow" ><a href="http://i.stack.imgur.com/xCAxY.png" rel="nofollow">http://i.stack.imgur.com/xCAxY.png</a></a><br>
  Here is my CSS</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>.first{
   padding-top:0px;
      padding-bottom: 0px; 
  background: url('../image/background.jpg');
  background-attachment:fixed;
      background-repeat:no-repeat;
     background-size:100% 100%;
      background-position: center;
       position: absolute;
  }</code></pre>
  </div>
  </div>
  </p>
  
  <p>here is code</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="first"&gt;
   
      &lt;div class="jumbotron" style="margin-left:0px;"&gt;
          &lt;h1&gt;ASP.NET&lt;/h1&gt;
          &lt;p class="lead"&gt;ASP.NET is a free web framework for building great Web sites and Web applications using HTML, CSS and JavaScript.&lt;/p&gt;
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      &lt;/div&gt;
  
      &lt;div class="row"&gt;
          &lt;div class="col-lg-4"&gt;
              &lt;h2&gt;Getting started&lt;/h2&gt;
              &lt;p&gt;
                  ASP.NET MVC gives you a powerful, patterns-based way to build dynamic websites that
                  enables a clean separation of concerns and gives you full control over markup
                  for enjoyable, agile development.
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          &lt;/div&gt;
          &lt;div class="col-lg-4"&gt;
              &lt;h2&gt;Get more libraries&lt;/h2&gt;
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          &lt;/div&gt;
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          &lt;/div&gt;
      &lt;/div&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>