diff --git a/ace/index.html b/ace/index.html
index 4ca5bcc..4ef36f4 100644
--- a/ace/index.html
+++ b/ace/index.html
@@ -51,7 +51,7 @@
             <!--<button id="btnSave" onClick="save()" class="btn btn_g">save</button>-->
             <button id="btnUndo" onClick="editor.undo()" class="btn">↶</button>
             <button id="btnRedo" onClick="editor.redo()" class="btn btn_g">↷</button>
-          	<button id="btnFs" onclick="toggleFullscreen() class="btn"">◻</button>
+          	<button id="btnFs" onclick="toggleFullscreen()" class="btn">◻</button>
         </div>
         <div class="inner" id="editor"></div>