Update playground.html

playground.html

@@ -903,11 +903,11 @@ code.unblur-token:not(pre code) {
         </footer>
     </div>
 
-    <!-- <button id="invert-btn" title="Invert Colors">
+    <<button id="invert-btn" title="Invert Colors">
         <svg id="sun-moon-icon" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor" class="sun">
             <path d="M12 2.25a.75.75 0 01.75.75v1.5a.75.75 0 01-1.5 0V3a.75.75 0 01.75-.75zM12 19.5a.75.75 0 01.75.75v1.5a.75.75 0 01-1.5 0v-1.5a.75.75 0 01.75-.75zM17.703 8.497a.75.75 0 011.06 1.06l-1.06 1.06a.75.75 0 01-1.06-1.06l1.06-1.06zM6.343 17.657a.75.75 0 011.06-1.06l1.06 1.06a.75.75 0 01-1.06 1.06l-1.06-1.06zM21.75 12a9.75 9.75 0 11-19.5 0 9.75 9.75 0 0119.5 0z" />
         </svg>
-    </button> -->
+    </button>
 
     <div id="confirmation-modal" class="modal-overlay" style="display: none;">
         <div class="modal-content">