diff --git a/adafruit_progressbar.py b/adafruit_progressbar.py
index 5619144..6eea67c 100755
--- a/adafruit_progressbar.py
+++ b/adafruit_progressbar.py
@@ -117,12 +117,17 @@ def progress(self, value):
         ), "Progress value must be a floating point value."
         if self._progress_val > value:
             # uncolorize range from width*value+margin to width-margin
-            for _w in range(int(value * self._width + 2), self._width - 2):
+            # from right to left
+            _prev_pixel = max(2, int(self._width * self._progress_val - 2))
+            _new_pixel = max(int(self._width * value - 2), 2)
+            for _w in range(_prev_pixel, _new_pixel - 1, -1):
                 for _h in range(2, self._height - 2):
                     self._bitmap[_w, _h] = 0
         else:
-            # fully fill progress bar color
-            for _w in range(2, self._width * value - 2):
+            # fill from the previous x pixel to the new x pixel
+            _prev_pixel = max(2, int(self._width * self._progress_val - 3))
+            _new_pixel = min(int(self._width * value - 2), int(self._width * 1.0 - 3))
+            for _w in range(_prev_pixel, _new_pixel + 1):
                 for _h in range(2, self._height - 2):
                     self._bitmap[_w, _h] = 2
         self._progress_val = value
diff --git a/examples/progressbar_simpletest.py b/examples/progressbar_simpletest.py
index e5bb43d..70952d3 100644
--- a/examples/progressbar_simpletest.py
+++ b/examples/progressbar_simpletest.py
@@ -27,10 +27,11 @@
 
 current_progress = 0.0
 while True:
-    while current_progress <= 1.0:
-        print("Progress: {}%".format(current_progress * 100))
-        progress_bar.progress = current_progress
-        current_progress += 0.05
-        if current_progress >= 1.0:
-            current_progress = 0.0
+    # range end is exclusive so we need to use 1 bigger than max number that we want
+    for current_progress in range(0, 101, 1):
+        print("Progress: {}%".format(current_progress))
+        progress_bar.progress = current_progress / 100  # convert to decimal
         time.sleep(0.01)
+    time.sleep(0.3)
+    progress_bar.progress = 0.0
+    time.sleep(0.3)