Added tests for sounds and modified the transparency for the chat history window.

#story[1245]

src/main/java/seng302/visualiser/controllers/dialogs/ServerCreationController.java

@@ -6,6 +6,7 @@ import com.jfoenix.controls.JFXTextField;
 import com.jfoenix.validation.RequiredFieldValidator;
 import java.net.URL;
 import java.util.ResourceBundle;
+import javafx.application.Platform;
 import javafx.fxml.FXML;
 import javafx.fxml.Initializable;
 import javafx.scene.control.Label;
@@ -47,6 +48,7 @@ public class ServerCreationController implements Initializable {
             Sounds.playButtonClick();
             validateServerSettings();
         });
+
     }
 
     /**