Update app.py

app.py

@@ -157,14 +157,15 @@ theme = gr.themes.Base().set(
 
 custom_css = """
 <style>
+    @import url('https://fonts.googleapis.com/css2?family=Roboto:wght@400;700&display=swap');
     body {
-        font-family: 'Arial', sans-serif;
+        font-family: 'Roboto', sans-serif;
     }
     .gr-text-input, .gr-textbox, .gr-markdown, .gr-html {
-        font-family: 'Arial', sans-serif;
+        font-family: 'Roboto', sans-serif;
     }
     .gr-button {
-        font-family: 'Arial', sans-serif;
+        font-family: 'Roboto', sans-serif;
     }
 </style>
 """