diff --git a/frontend/src/app/pages/header/header/header.component.html b/frontend/src/app/pages/header/header/header.component.html
index edd63f4..6cc8e61 100644
--- a/frontend/src/app/pages/header/header/header.component.html
+++ b/frontend/src/app/pages/header/header/header.component.html
@@ -130,7 +130,19 @@
               <li class="nav_li"><a class="nav_link2" target="_blank" href="https://alttd.com/blog/">Blog</a></li>
             </ul>
           </li>
+          <li class="nav_li" *ngIf="isAuthenticated">
+            <a [id]="getCurrentPageId(['particles'])"
+               class="nav_link fake_link" [ngClass]="active">Special</a>
+            <ul class="dropdown" *ngIf="hasAccess(['HEAD_MOD'])">
+              <li class="nav_li"><a class="nav_link2" [routerLink]="['/particles']">Particles</a></li>
+            </ul>
+          </li>
         </ul>
+        <ng-container *ngIf="!isAuthenticated">
+          <button mat-button (click)="openLoginDialog()" style="color: white">
+            Login
+          </button>
+        </ng-container>
         <app-theme></app-theme>
       </div>
     </nav>
diff --git a/frontend/src/app/pages/header/header/header.component.ts b/frontend/src/app/pages/header/header/header.component.ts
index 89f3986..21d1d29 100644
--- a/frontend/src/app/pages/header/header/header.component.ts
+++ b/frontend/src/app/pages/header/header/header.component.ts
@@ -1,7 +1,12 @@
-import {Component, HostListener, Input} from '@angular/core';
+import {Component, HostListener, Input, OnDestroy, OnInit} from '@angular/core';
 import {CommonModule, NgOptimizedImage} from '@angular/common';
 import {ThemeComponent} from '@shared-components/theme/theme.component';
 import {RouterLink} from '@angular/router';
+import {AuthService} from '@services/auth.service';
+import {Subscription} from 'rxjs';
+import {LoginDialogComponent} from '@shared-components/login/login.component';
+import {MatButton} from '@angular/material/button';
+import {MatDialog} from '@angular/material/dialog';
 
 @Component({
   standalone: true,
@@ -9,13 +14,14 @@ import {RouterLink} from '@angular/router';
     CommonModule,
     ThemeComponent,
     RouterLink,
-    NgOptimizedImage
+    NgOptimizedImage,
+    MatButton
   ],
   selector: 'app-header',
   templateUrl: './header.component.html',
   styleUrls: ['./header.component.scss']
 })
-export class HeaderComponent {
+export class HeaderComponent implements OnInit, OnDestroy {
   @Input() current_page: string = '';
   @Input() background_image: string = '';
   @Input() height: string = '';
@@ -23,6 +29,24 @@ export class HeaderComponent {
 
   public active: string = '';
   public inverseYPos: number = 0;
+  private subscription: Subscription | undefined;
+  public isAuthenticated: boolean = false;
+
+  constructor(protected authService: AuthService,
+              private dialog: MatDialog) {
+
+  }
+
+  ngOnInit(): void {
+    this.subscription = this.authService.isAuthenticated$.subscribe(isAuthenticated => {
+        this.isAuthenticated = isAuthenticated;
+      }
+    );
+  }
+
+  ngOnDestroy(): void {
+    this.subscription?.unsubscribe();
+  }
 
   @HostListener('window:scroll', [])
   onWindowScroll(): void {
@@ -59,4 +83,17 @@ export class HeaderComponent {
       return '';
     }
   }
+
+  public openLoginDialog() {
+    const dialogRef = this.dialog.open(LoginDialogComponent, {
+      width: '400px',
+    })
+    dialogRef.afterClosed().subscribe(result => {
+      console.log(result);
+    });
+  }
+
+  public hasAccess(claims: string[]): boolean {
+    return this.authService.hasAccess(claims)
+  }
 }
diff --git a/frontend/src/app/services/auth.service.ts b/frontend/src/app/services/auth.service.ts
index 114dbed..d7af5d6 100644
--- a/frontend/src/app/services/auth.service.ts
+++ b/frontend/src/app/services/auth.service.ts
@@ -112,4 +112,8 @@ export class AuthService {
     const claims = this.userClaimsSubject.getValue();
     return claims?.authorizations || [];
   }
+
+  public hasAccess(authorization: string[]): boolean {
+    return this.getUserAuthorizations().filter(entry => authorization.includes(entry)).length > 0;
+  }
 }
diff --git a/frontend/src/app/shared-components/login/login.component.html b/frontend/src/app/shared-components/login/login.component.html
index 3c8865a..81ef567 100644
--- a/frontend/src/app/shared-components/login/login.component.html
+++ b/frontend/src/app/shared-components/login/login.component.html
@@ -3,10 +3,19 @@
   <form [formGroup]="loginForm">
     <mat-form-field appearance="fill" style="width: 100%">
       <mat-label>Enter your code</mat-label>
-      <input matInput formControlName="code" type="text">
-      <mat-error *ngIf="formHasError()">
+      <input matInput formControlName="code" type="text" (keydown)="onKeyDown($event)">
+      <mat-error *ngIf="loginForm.get('code')?.errors?.['required']">
         Code is required
       </mat-error>
+      <mat-error *ngIf="loginForm.get('code')?.errors?.['minlength']">
+        Code must be 8 characters
+      </mat-error>
+      <mat-error *ngIf="loginForm.get('code')?.errors?.['maxlength']">
+        Code cannot exceed 8 characters
+      </mat-error>
+      <mat-error *ngIf="loginForm.get('code')?.errors?.['pattern']">
+        Code contains invalid characters
+      </mat-error>
     </mat-form-field>
   </form>
 </div>
diff --git a/frontend/src/app/shared-components/login/login.component.ts b/frontend/src/app/shared-components/login/login.component.ts
index f729541..76e63f1 100644
--- a/frontend/src/app/shared-components/login/login.component.ts
+++ b/frontend/src/app/shared-components/login/login.component.ts
@@ -65,7 +65,23 @@ export class LoginDialogComponent {
     });
   }
 
-  public formHasError() {
-    return this.loginForm.get('code')?.hasError('required');
+  onKeyDown(event: KeyboardEvent): void {
+    if (event.key.length === 1 && event.key >= 'a' && event.key <= 'z') {
+      event.preventDefault();
+      const input = event.target as HTMLInputElement;
+      const start = input.selectionStart || 0;
+      const end = input.selectionEnd || 0;
+
+      const value = this.loginForm.get('code')?.value || '';
+      const newValue =
+        value.substring(0, start) +
+        event.key.toUpperCase() +
+        value.substring(end);
+
+      this.loginForm.get('code')?.setValue(newValue);
+      setTimeout(() => {
+        input.setSelectionRange(start + 1, start + 1);
+      });
+    }
   }
 }