change html layout, better format number

index.html

@@ -25,11 +25,12 @@
 	<option value='GBP'>GBP</option>
 </select>
 
+<button onClick='convert()'>Convert</button>
+
 <p>
 Converted: <span id='res'></span>
 </p>
 
-<button onClick='convert()'>Convert</button>
 
 <script src='script.js'></script>
 </body>