Added back an example that uses a negative angle.

Author: tabatkins

css3-images/Overview.html

@@ -804,7 +804,8 @@ <h4 class=no-toc id=linear-gradient-examples><span class=secno>5.1.2.
     box is pure yellow, and the bottom-right of the box is pure blue. The
     difference is in the angle that the gradient follows.</p>
 
-   <pre><code>linear-gradient(135deg, yellow, blue);</code></pre>
+   <pre><code>linear-gradient(135deg, yellow, blue);
+linear-gradient(-45deg, blue, yellow);</code></pre>
 
    <p><img alt="" src=linear3.png></p>
   </div>

css3-images/Overview.src.html

@@ -556,7 +556,8 @@ <h4 class='no-toc' id='linear-gradient-examples'>
 		box is pure yellow, and the bottom-right of the box is pure blue.  The 
 		difference is in the angle that the gradient follows.</p>
 
-		<pre><code>linear-gradient(135deg, yellow, blue);</code></pre>
+		<pre><code>linear-gradient(135deg, yellow, blue);
+linear-gradient(-45deg, blue, yellow);</code></pre>
 
 		<p><img src="linear3.png" alt="" ></p>
 	</div>