Update app.py

app.py

@@ -3,10 +3,10 @@ from fastapi.templating import Jinja2Templates
 from fastapi.responses import HTMLResponse
 import os
 def format(codigo:str):
-   return f"""\documentclass{{article}}
-\begin{{document}}
+   return f"""\\documentclass{{article}}
+\\begin{{document}}
 {codigo}
-\end{{document}}"""
+\\end{{document}}"""
 from subprocess import run
 app=FastAPI();
 templates = Jinja2Templates(directory="templates")