GUAC-932: Style no-recent to be a bit more subdued.

guacamole/src/main/webapp/app/home/styles/home.css

@@ -49,8 +49,8 @@ div.recent-connections {
 
 .no-recent {
 
-    color: black;
-    text-shadow: 1px 1px white;
+    color: rgba(255, 255, 255, 0.5);
+    text-shadow: -1px -1px rgba(0, 0, 0, 0.5);
     opacity: 0.5;
     
     font-size: 2em;