Update app.py

app.py

@@ -116,6 +116,10 @@ async def script1_js():
 async def script2_js():
     return FileResponse("script2.js")
 
+@app.get("/styles.css")
+async def styles_css():
+    return FileResponse("styles.css")
+
 @app.get("/")
 async def read_index():
     return FileResponse('index.html')