Update News_app.py

News_app.py

@@ -31,7 +31,7 @@ def set_background(local_image_path):
     <style>
     .stApp {{
         background-image: url("data:image/png;base64,{encoded_string}");
-        background-size: 92%;
+        background-size: cover;
         background-position: center center;
         background-repeat: no-repeat;
         background-attachment: fixed;