fix: replace main class with container class

web/src/components/home.tsx

@@ -5,7 +5,7 @@ import Box from '@mui/material/Box'
 
 const Home = () => {
   return (
-    <Box className="main">
+    <Box className="container">
       <CssBaseline />
       <h2>Welcome to SASjs Server!</h2>
       <p>

web/src/components/login.tsx

@@ -38,7 +38,7 @@ const Login = () => {
 
   return (
     <Box
-      className="main"
+      className="container"
       component="form"
       onSubmit={handleSubmit}
       sx={{

web/src/components/updatePassword.tsx

@@ -69,7 +69,7 @@ const UpdatePassword = () => {
     />
   ) : (
     <Box
-      className="main"
+      className="container"
       component="form"
       onSubmit={handleSubmit}
       sx={{