style: change font family for gradio app

app.py

@@ -77,6 +77,10 @@ LOGO_PATH = "resources/pialogo.png"
 
 # CSS customizations
 custom_css = """
+@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600&display=swap');
+body, .markdown-content, .container, .chat-container, .message-container {
+    font-family: 'Inter', Arial, sans-serif !important;
+}
 .container {
     max-width: 2200px !important;
     margin: auto;