Update README.md

Author: rorymcd98

README.md

@@ -4,18 +4,18 @@
 
 Play now at [chess-css.herokuapp.com](https://chess-css.herokuapp.com/)
 
-##Preview
+<h2 align="center">Preview<h2> 
 
 ![text](https://i.imgur.com/tO3bYib.png)
 
-##Game features
+<h2>Game features<h2> 
 
 - Built-in editor to edit CSS, change how the board operates and looks
 - Drag and drop elements (pieces, legend, board) into the editor to automatically generate text
 - Hover over pieces to view the available moves, accounting for CSS changes
 - Multiplayer supported through socket.io with automatic rejoining and restoring game state
 
-##Instructions
+<h2>Instructions<h2> 
 
 * Get the latest release
 
@@ -29,4 +29,4 @@ npm run build
 npm run start
 ```
 
-* Open your browser and visit http://localhost:3000/ (or your environment's specified port)
+* Open your browser and visit http://localhost:3000/ (or your environment's specified port)