added border on post on feed

src/components/AuthModal.jsx

@@ -1,5 +1,5 @@
 // src/components/AuthModal.jsx
-import { useState } from "react";
+import { useState, useEffect } from "react";
 import { useTranslation } from 'react-i18next';
 import CloseIcon from "./icons/CloseIcon";
 import { useAuthContext } from "../context/AuthContext";
@@ -14,6 +14,12 @@ export default function AuthModal({ onClose }) {
   const [mode, setMode] = useState("login"); // "login" | "register"
   const { login: saveAuth } = useAuthContext();
 
+  useEffect(() => {
+    const prev = document.body.style.overflow;
+    document.body.style.overflow = "hidden";
+    return () => { document.body.style.overflow = prev; };
+  }, []);
+
   return (
       <div className="f-modal-bg auth-modal-bg" onClick={e => e.target === e.currentTarget && onClose()}>
         <div className="f-modal auth-modal">