diff --git a/interface.php b/interface.php
index 3cb9737..6a433ff 100644
--- a/interface.php
+++ b/interface.php
@@ -1,3 +1,10 @@
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.8.0/styles/vs.min.css">
+<script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.8.0/highlight.min.js"></script>
+
+<!-- and it's easy to individually load additional languages -->
+<script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.8.0/languages/go.min.js"></script>
+
 <?php
 session_start();
 
@@ -7,28 +14,13 @@
 }
 
 ?>
-<head>
-	<title>HAWKI</title>
-	<?php 
-  if (file_exists(".env")){
-	$env = parse_ini_file('.env');
-  }
-  $favicon = isset($env) ? ($env["FAVICON_URI"]??false) : getenv("FAVICON_URI");
-  if ($favicon) {
-	echo 
-	'<link rel="shortcut icon" type="image/x-icon" href="'. $favicon .'" media="screen" />
-	<link rel="icon" type="image/x-icon" href="'. $favicon .'" media="screen" />
-	';
-  }
- ?>
- </head>
-<meta name="viewport" content="width=device-width, initial-scale=1">
-<link rel="stylesheet" href="app.css">
+
+<link rel="stylesheet" href="app.css">	
 
 <div class="wrapper">
   <div class="sidebar">
 	<div class="logo" onclick="load(this, 'chat.htm')">
-	 <img src="/img/logo.svg" alt="Logo">
+	 <img src="/img/hawki.svg" alt="HAWK Logo" width="150px">
 	</div>
 	<div class="menu">
 		<details>
@@ -124,17 +116,11 @@
 		
 	</div>
 	<div class="info">
-	  <a href="#" onclick="load(this, 'about.htm')">Über HAWKI</a>
+	  <a href="#" onclick="load(this, 'about.htm')">Über HAWK-KI</a>
 	  <a href="#" id="feedback" onclick="load(this, 'userpost.php')">Feedback</a>
-	  <a href=<?php 
-	  	if (file_exists(".env")){
-			$env = parse_ini_file('.env');
-		}
-		if ((isset($env) ? $env["Authentication"] : getenv("Authentication")) == "OIDC"){
-		echo "oidc_logout.php";
-		} else echo "logout.php" ?>>Abmelden (<?php echo $_SESSION['username']?>)</a>
+	  <a href="logout.php">Abmelden</a>
 	  <br>
-	  <a href="/datenschutz" target="_blank" >Datenschutz</a>
+	  <a href="#" onclick="load(this, 'datenschutz.htm')">Datenschutz</a>
 	  <a href="/impressum" target="_blank">Impressum</a>
 	</div>
   </div>
@@ -223,8 +209,6 @@
 	  
   </div>
   
-  
-  
   <template id="message">
 		 <div class="message">
 			 <div class="message-content">
@@ -247,6 +231,16 @@
 	</div>
 </div>
 
+<div class="modal" onclick="modalClick(this)" id="gpt4"> 
+	<div class="modal-content">
+		<h2>Upgrade auf GPT4</h2>
+		<p>Die Hochschule stellt Ihnen jetzt GPT4 zur Verfügung. 
+			Komplexere Eingaben können nun besser verstanden und verarbeitet werden.
+			Sie sollten nun präzisere Antworten erhalten. Die Wartezeit auf eine Antwort kann sich geringfügig verlängern.</p>
+		<button>Bestätigen</button>
+	</div>
+</div>
+
 <script>
 	visualViewport.addEventListener("resize", update);
 	visualViewport.addEventListener("scroll", update);
@@ -425,7 +419,6 @@ function escapeHTML(str) {
               .replace(/"/g, '&quot;')
               .replace(/'/g, '&#039;');
 }
-	
 
 	
 	function addMessage(message){
@@ -440,7 +433,7 @@ function addMessage(message){
 		if(message.role == "assistant"){
 			messageElement.querySelector(".message-icon").textContent = "AI";
 		}else{
-			messageElement.querySelector(".message-icon").textContent = '<?= isset($_SESSION['initials']) ? $_SESSION['initials']: $_SESSION['username'] ?>';
+			messageElement.querySelector(".message-icon").textContent = '<?= $_SESSION['username'] ?>';
 			messageElement.querySelector(".message").classList.add("me");
 		}
 		
@@ -475,6 +468,10 @@ function copyToInput(selector) {
 		document.querySelector("#data-protection").remove();
 	}
 	
+	if(localStorage.getItem("gpt4")){
+		document.querySelector("#gpt4").remove();
+	}
+	
 	function modalClick(element){
 		localStorage.setItem(element.id, "true")
 		element.remove();
@@ -487,7 +484,7 @@ function modalClick(element){
 		const inputField = document.querySelector(".userpost-field");
 		
 		let message = {};
-		message.role = '<?= isset($_SESSION['initials']) ? $_SESSION['initials']: $_SESSION['username'] ?>';
+		message.role = '<?= $_SESSION['username'] ?>';
 		message.content = inputField.value.trim();
 		
 		fetch('userpost.php', {
