Update app.py

app.py

@@ -344,7 +344,7 @@ def generate_certificate(certificate_model, first_name, last_name):
     d.text((1480, 1170), str(date.today()), fill="black", anchor="mm", font=date_font)
 
     im_temp = im.load()
-    background = Image.new("RGB", im_temp.size, (255, 255, 255))
+    background = Image.new("RGB", im.size, (255, 255, 255))
     background.paste(im_temp, mask=png.split()[3]) # 3 is the alpha channel
     
     pdf = background.save("certificate"+".pdf")