Make front page color better.

index.html

@@ -89,7 +89,7 @@ var _hmt = _hmt || [];
         <div class="header-content-inner">
             <h1>PaddlePaddle</h1>
             <hr>
-	    <p style="color: #00ffd6">Open and Easy-to-Use Deep Learning Platform for Enterprise and Research</p>
+	    <p style="color: white; background-color: rgba(0, 0, 0, 0.6);">Open and Easy-to-Use Deep Learning Platform for Enterprise and Research</p>
 	    <a href="http://book.paddlepaddle.org/index.en.html" class="btn btn-primary btn-xl page-scroll btn-pd">Deep Learning 101</a>
 	    <a href="http://paddlepaddle.org/doc/" class="btn btn-primary btn-xl page-scroll btn-pd">Documentation</a>
 	    <a href="https://github.com/baidu/paddle" class="btn btn-primary btn-xl page-scroll btn-pd">Code</a>