style: reduce max-width of login card for improved layout

- Decrease max-width of the login card from 650px to 450px to enhance responsiveness and visual appeal

src/views/login/index.vue

@@ -224,7 +224,7 @@ function goHelp() {
 
 .login__card {
   width: 100%;
-  max-width: 650px;
+  max-width: 450px;
   padding: 36px 32px 28px;
   border-radius: 16px;
   background: rgba(255, 255, 255, 0.06);