MAPG-103 unify some styles and show map name in the header

public/static/css/game.css

@@ -100,6 +100,9 @@
 }
 
 @media screen and (max-width: 599px) {
+    #mapName {
+        display: none;
+    }
     #showGuessButtonContainer {
         position: absolute;
         left: 20px;