title: mouse hover, css div effect, alpha and new button
body: <p>I have a little question.</p>
  
  <p>I have div 200*200 px. I need effect:
  - when user mouse hover on div: alpha 70% black picture
  - show new button at middle of picture (or textual link) for example "Add to cart"</p>
  
  <p>You can see my example here: <a href="http://jsfiddle.net/t8jPN" rel="nofollow">http://jsfiddle.net/t8jPN</a></p>
  
  <pre><code>    &lt;div class="wrapper"&gt;
  &lt;div class="ribbon-wrapper-green"&gt;&lt;div class="ribbon-green"&gt;NEW&lt;/div&gt;&lt;/div&gt;
  &lt;img src="http://cdn.sheknows.com/articles/2011/05/summer-dresses4.jpg"&gt;&lt;/img&gt;
  &lt;/div&gt;
  
  .wrapper {
  margin: 50px auto;
  width: 200px;
  height: 200px;
  background: white;
  border-radius: 2px;
  -webkit-box-shadow: 0px 0px 8px rgba(0,0,0,0.3);
  -moz-box-shadow:    0px 0px 8px rgba(0,0,0,0.3);
  box-shadow:         0px 0px 8px rgba(0,0,0,0.3);
  position: relative;
  z-index: 90;
  }
  
  .ribbon-wrapper-green {
  width: 85px;
  height: 88px;
  overflow: hidden;
  position: absolute;
  top: -3px;
  right: -3px;
  }
  
  .ribbon-green {
  font: bold 15px Sans-Serif;
  color: #ffffff;
  text-align: center;
  
  -webkit-transform: rotate(45deg);
  -moz-transform:    rotate(45deg);
  -ms-transform:     rotate(45deg);
  -o-transform:      rotate(45deg);
  position: relative;
  padding: 7px 0;
  left: -5px;
  top: 15px;
  width: 120px;
  background-color: #BFDC7A;
  background-image: -webkit-gradient(linear, left top, left bottom, from(#BFDC7A), to(#8EBF45)); 
  background-image: -webkit-linear-gradient(top, #BFDC7A, #8EBF45); 
  background-image:    -moz-linear-gradient(top, #BFDC7A, #8EBF45); 
  background-image:     -ms-linear-gradient(top, #BFDC7A, #8EBF45); 
  background-image:      -o-linear-gradient(top, #BFDC7A, #8EBF45); 
  color: #6a6340;
  -webkit-box-shadow: 0px 0px 3px rgba(0,0,0,0.3);
  -moz-box-shadow:    0px 0px 3px rgba(0,0,0,0.3);
  box-shadow:         0px 0px 3px rgba(0,0,0,0.3);
  }
  
  .ribbon-green:before, .ribbon-green:after {
  content: "";
  border-top:   3px solid #6e8900;   
  border-left:  3px solid transparent;
  border-right: 3px solid transparent;
  position:absolute;
  bottom: -3px;
  }
  
  .ribbon-green:before {
  left: 0;
  }
  .ribbon-green:after {
  right: 0;
  }
  </code></pre>
  
  <p>Thanks</p>