Update app.py

app.py

@@ -342,11 +342,17 @@ def generate_certificate(certificate_model, first_name, last_name):
 
     # Date of certification
     d.text((1480, 1170), str(date.today()), fill="black", anchor="mm", font=date_font)
-  
-    pdf = im.save("certificate"+".pdf")
+
+    im_temp = conv_rgba_to_rgb(im)
+    pdf = im_temp.save("certificate"+".pdf")
 
     return im, pdf
 
+def conv_rgba_to_rgb(_rgba):
+  _rgba = Image.open(_rgba)
+  _rgb = Image.new('RGB', _rgba.size, (255, 255, 255))
+  _rgb.paste(_rgba, mask=_rgba.split()[3])
+  return _rgb
 
 def add_certified_user(hf_username, first_name, last_name, pass_percentage):
   """