diff --git a/README.md b/README.md
index 23eaa371..132b823a 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ jsPsych is a JavaScript library for creating behavioral experiments that run in
 Code Demos
 ----------
 
-Demo 1 with the instructions plugin:
+[Demo 1](https://github.com/jspsych/jsPsych/tree/master/examples/demos/demo_1.html) with the instructions plugin:
 <div display="flex">
 <img src="https://user-images.githubusercontent.com/14092539/28126774-801ea42e-66f8-11e7-9b6a-c8bad0026bec.gif" align="right" width=50% />
 
@@ -62,7 +62,7 @@ Demo 1 with the instructions plugin:
 </div>
 
 
-Demo 2 with the image-keyboard-response plugin:
+[Demo 2](https://github.com/jspsych/jsPsych/tree/master/examples/demos/demo_2.html) with the image-keyboard-response plugin:
 <div display="flex">
 <img src="https://user-images.githubusercontent.com/14092539/28125911-0504cca2-66f6-11e7-8f5b-c9686f63aaa8.gif" align="right" width=50% />
 
@@ -116,7 +116,7 @@ Demo 2 with the image-keyboard-response plugin:
 </div>
 
 
-And for a slightly longer experiment example, demo 3 with the html-keyboard-response plugin. Also shows data after experiment ends:
+And for a slightly longer experiment example, [demo 3](https://github.com/jspsych/jsPsych/tree/master/examples/demos/demo_3.html) with the html-keyboard-response plugin. Also shows data after experiment ends:
 <div display="flex">
 <img src="https://user-images.githubusercontent.com/14092539/28126802-97b50d08-66f8-11e7-9a45-46561ab51a5f.gif" align="right" width=50% />
 
@@ -149,10 +149,12 @@ var debrief = {
       .filter({stim_type: 'congruent'}).select('rt').mean());
   var incongruent_rt = Math.round(jsPsych.data.get()
       .filter({stim_type: 'incongruent'}).select('rt').mean());
-  return "<p>Your average response time for congruent trials"+ 
-  "was <strong>"+congruent_rt+"ms</strong>.</p>"+
-  "<p>Your average response time for incongruent trials was"+
-  "<strong>"incongruent_rt + "ms</strong>.</p>";
+  return "<p style='font-size:25px'>Your average response"+
+  "time for congruent trials was <strong>"+congruent_rt+
+  "ms</strong>.</p>"+
+  "<p style='font-size:25px'>Your average response time for"+
+  "incongruent trials was <strong>"incongruent_rt + 
+  "ms</strong>.</p>";
   }
 };
 
diff --git a/examples/demos/demo_2.html b/examples/demos/demo_2.html
index 0613ee3e..87b90190 100644
--- a/examples/demos/demo_2.html
+++ b/examples/demos/demo_2.html
@@ -17,21 +17,21 @@
 		type: "image-keyboard-response",
 		stimulus: 'img/happy_face_1.jpg',
 		choices: [89, 78],
-		prompt: '<p class="center-content">Is this face happy? Y or N.</p>'
+		prompt: '<p>Is this face happy? Y or N.</p>'
   }
 
   var trial_2 = {
     type: 'image-keyboard-response',
     stimulus: 'img/sad_face_2.jpg',
     choices: [89, 78], // Y or N
-    prompt: '<p class="center-content">Is this face happy? Y or N.</p>'
+    prompt: '<p>Is this face happy? Y or N.</p>'
   }
 
   var trial_3 = {
     type: 'image-keyboard-response',
     stimulus: 'img/happy_face_2.jpg',
     choices: [89, 78], // Y or N
-    prompt: '<p class="center-content">Is this face happy? Y or N.</p>',
+    prompt: '<p>Is this face happy? Y or N.</p>',
   }
 
 
diff --git a/plugins/jspsych-audio-button-response.js b/plugins/jspsych-audio-button-response.js
index f51eaad4..884473ca 100644
--- a/plugins/jspsych-audio-button-response.js
+++ b/plugins/jspsych-audio-button-response.js
@@ -50,13 +50,13 @@ jsPsych.plugins["audio-button-response"] = (function() {
         description: ''
       },
       margin_vertical: {
-        type: jsPsych.parameterType.STRING,
+        type: jsPsych.plugins.parameterType.STRING,
         default: '0px',
         no_function: false,
         description: ''
       },
       margin_horizontal: {
-        type: jsPsych.parameterType.STRING,
+        type: jsPsych.plugins.parameterType.STRING,
         default: '8px',
         no_function: false,
         description: ''
@@ -79,13 +79,13 @@ jsPsych.plugins["audio-button-response"] = (function() {
   	plugin.trial = function(display_element, trial) {
 
     // default trial parameters
-    trial.button_html = trial.button_html || '<button class="jspsych-btn">%choice%</button>';
-    trial.response_ends_trial = (typeof trial.response_ends_trial === 'undefined') ? true : trial.response_ends_trial;
-    trial.trial_ends_after_audio = (typeof trial.trial_ends_after_audio === 'undefined') ? false : trial.trial_ends_after_audio;
-    trial.trial_duration = trial.trial_duration || -1; // if -1, then wait for response forever
-    trial.prompt = (typeof trial.prompt === 'undefined') ? "" : trial.prompt;
-    trial.margin_vertical = trial.margin_vertical || "0px";
-    trial.margin_horizontal = trial.margin_horizontal || "8px";
+    // trial.button_html = trial.button_html || '<button class="jspsych-btn">%choice%</button>';
+    // trial.response_ends_trial = (typeof trial.response_ends_trial === 'undefined') ? true : trial.response_ends_trial;
+    // trial.trial_ends_after_audio = (typeof trial.trial_ends_after_audio === 'undefined') ? false : trial.trial_ends_after_audio;
+    // trial.trial_duration = trial.trial_duration || -1; // if -1, then wait for response forever
+    // trial.prompt = (typeof trial.prompt === 'undefined') ? "" : trial.prompt;
+    // trial.margin_vertical = trial.margin_vertical || "0px";
+    // trial.margin_horizontal = trial.margin_horizontal || "8px";
 
     // setup stimulus
     var context = jsPsych.pluginAPI.audioContext();