diff --git a/Demo_Keyboard.py b/Demo_Keyboard.py
index 85f63b8a..88c5fc5d 100644
--- a/Demo_Keyboard.py
+++ b/Demo_Keyboard.py
@@ -1,26 +1,23 @@
-import sys
 import PySimpleGUI as sg
 
 # Recipe for getting keys, one at a time as they are released
 # If want to use the space bar, then be sure and disable the "default focus"
 
-with sg.FlexForm('Realtime Keyboard Test', return_keyboard_events=True, use_default_focus=False) as form:
-    text_elem = sg.Text('', size=(12,1))
-    layout = [[sg.Text('Press a key')],
+with sg.FlexForm("Keyboard Test", return_keyboard_events=True, use_default_focus=False) as form:
+    text_elem = sg.Text("", size=(18,1))
+    layout = [[sg.Text("Press a key or scroll mouse")],
               [text_elem],
-              [sg.SimpleButton('OK')]]
+              [sg.SimpleButton("OK")]]
 
     form.Layout(layout)
     # ---===--- Loop taking in user input --- #
     while True:
-        button, value = form.Read()
+        button, value = form.ReadNonBlocking()
 
-        if button == 'OK':
-            print(button, 'exiting')
+        if button == "OK" or (button is None and value is None):
+            print(button, "exiting")
             break
         if button is not None:
             text_elem.Update(button)
-        else:
-            break
 
 
diff --git a/Demo_Keyboard_Realtime.py b/Demo_Keyboard_Realtime.py
index bb1d145e..25812024 100644
--- a/Demo_Keyboard_Realtime.py
+++ b/Demo_Keyboard_Realtime.py
@@ -1,19 +1,16 @@
 import PySimpleGUI as sg
 
-# Recipe for getting a continuous stream of keys when using a non-blocking form
-# If want to use the space bar, then be sure and disable the "default focus"
-
-with sg.FlexForm('Realtime Keyboard Test', return_keyboard_events=True, use_default_focus=False) as form:
-    layout = [[sg.Text('Hold down a key')],
-              [sg.SimpleButton('OK')]]
+with sg.FlexForm("Realtime Keyboard Test", return_keyboard_events=True, use_default_focus=False) as form:
+    layout = [[sg.Text("Hold down a key")],
+              [sg.SimpleButton("OK")]]
 
     form.Layout(layout)
-    # ---===--- Loop taking in user input --- #
+
     while True:
         button, value = form.ReadNonBlocking()
 
-        if button == 'OK':
-            print(button, value, 'exiting')
+        if button == "OK":
+            print(button, value, "exiting")
             break
         if button is not None:
             print(button)
diff --git a/Demo_PDF_Viewer.py b/Demo_PDF_Viewer.py
index ecd60c9c..6fd5fb42 100644
--- a/Demo_PDF_Viewer.py
+++ b/Demo_PDF_Viewer.py
@@ -37,6 +37,8 @@ import fitz
 import PySimpleGUI as sg
 from binascii import hexlify
 
+sg.ChangeLookAndFeel('GreenTan')
+
 if len(sys.argv) == 1:
     rc, fname = sg.GetFileBox('PDF Browser', 'PDF file to open', file_types=(("PDF Files", "*.pdf"),))
     if rc is False:
@@ -126,7 +128,7 @@ while True:
     if button is None:
         continue
 
-    if button in ("Escape:27"):  # this spares me a 'Quit' button!
+    if button in ("Escape:27",):  # this spares me a 'Quit' button!
         break
     # print("hex(button)", hexlify(button.encode()))
     if button[0] == chr(13):  # surprise: this is 'Enter'!