Update index.html

index.html

@@ -201,6 +201,7 @@ socket.on('response', function(data) {
     var currentMessage = messages.lastChild;
     if (data.response === 'complete') {
         currentMessage = null;
+      document.getElementById('btn').disabled = false
     } else {
         if (!currentMessage || !currentMessage.classList.contains('ai-response')) {
             currentMessage = document.createElement('p');