diff --git a/Application/lsb_rep.py b/Application/lsb_rep.py
index 1c74cca..b76f304 100644
--- a/Application/lsb_rep.py
+++ b/Application/lsb_rep.py
@@ -27,40 +27,43 @@ def encode():
 
 @app.route("/encoding", methods=['POST'])
 def encoding():
-    file = request.files['origin']
-    b2c = [int(x) for x in request.form.getlist("b2c")]
-    # b2c = [int(request.form['b2c'])]
-    payload = request.form['payload']
+    try:
+        file = request.files['origin']
+        b2c = [int(x) for x in request.form.getlist("b2c")]
+        # b2c = [int(request.form['b2c'])]
+        payload = request.form['payload']
 
-    if file.filename != "":
-        file.save(WORKING_PATH + file.filename)
+        if file.filename != "":
+            file.save(WORKING_PATH + file.filename)
 
-        file_extension = os.path.splitext(file.filename)[1]
-        if file_extension == ".png" or file_extension == ".bmp":
-            steg = img_steg.img_steg(WORKING_PATH + file.filename, b2c).encode(payload)
-            cv2.imwrite(WORKING_PATH + "encoded_" + file.filename, steg)
-            session['image'] = file.filename
-            session['image2'] = "encoded_" + file.filename
-        elif file_extension == ".wav":
-            steg = wav_steg.wav_steg(WORKING_PATH + file.filename, b2c).encode(payload)
+            file_extension = os.path.splitext(file.filename)[1]
+            if file_extension == ".png" or file_extension == ".bmp":
+                steg = img_steg.img_steg(WORKING_PATH + file.filename, b2c).encode(payload)
+                cv2.imwrite(WORKING_PATH + "encoded_" + file.filename, steg)
+                session['image'] = file.filename
+                session['image2'] = "encoded_" + file.filename
+            elif file_extension == ".wav":
+                steg = wav_steg.wav_steg(WORKING_PATH + file.filename, b2c).encode(payload)
 
-            # Write encoded data to file
-            new_wav_file = wave.open(WORKING_PATH + "encoded_" + file.filename, "wb")
-            new_wav_file.setnchannels(steg["num_channels"])
-            new_wav_file.setsampwidth(steg["sample_width"])
-            new_wav_file.setframerate(steg["frame_rate"])
-            new_wav_file.writeframes(steg["num_frames"])
-            new_wav_file.close()
-            session['wav'] = file.filename
-            session['wav2'] = "encoded_" + file.filename
-        elif file_extension == ".txt":
-            encoded_data = txt_steg.txt_steg(WORKING_PATH + file.filename, b2c).encode(payload)
-            with open(os.path.join(WORKING_PATH, "encoded_" + file.filename), "w") as f:
-                f.write(encoded_data)
-            session['txt'] = file.filename
-            session['txt2'] = "encoded_" + file.filename
+                # Write encoded data to file
+                new_wav_file = wave.open(WORKING_PATH + "encoded_" + file.filename, "wb")
+                new_wav_file.setnchannels(steg["num_channels"])
+                new_wav_file.setsampwidth(steg["sample_width"])
+                new_wav_file.setframerate(steg["frame_rate"])
+                new_wav_file.writeframes(steg["num_frames"])
+                new_wav_file.close()
+                session['wav'] = file.filename
+                session['wav2'] = "encoded_" + file.filename
+            elif file_extension == ".txt":
+                encoded_data = txt_steg.txt_steg(WORKING_PATH + file.filename, b2c).encode(payload)
+                with open(os.path.join(WORKING_PATH, "encoded_" + file.filename), "w") as f:
+                    f.write(encoded_data)
+                session['txt'] = file.filename
+                session['txt2'] = "encoded_" + file.filename
 
-        return redirect("/encode_result")
+            return redirect("/encode_result")
+    except:
+        return redirect("/unsupported")
 
 @app.route('/encode_result')
 def encode_result():
@@ -76,26 +79,29 @@ def decode():
 
 @app.route("/decoding", methods=['POST'])
 def decoding():
-    file = request.files['encoded_file']
-    b2c = [int(x) for x in request.form.getlist("b2c")]
-    if file.filename != "":
-        file.save(WORKING_PATH + file.filename)
+    try:
+        file = request.files['encoded_file']
+        b2c = [int(x) for x in request.form.getlist("b2c")]
+        if file.filename != "":
+            file.save(WORKING_PATH + file.filename)
 
-        file_extension = os.path.splitext(file.filename)[1]
-        if file_extension == ".png" or file_extension == ".bmp":
-            payload = img_steg.img_steg(WORKING_PATH + file.filename, b2c).decode()
-            session["payload"] = payload
-            session["image"] = file.filename
-        elif file_extension == ".wav":
-            payload = wav_steg.wav_steg(WORKING_PATH + file.filename, b2c).decode()
-            session["payload"] = payload
-            session["wav"] = file.filename
-        elif file_extension == ".txt":
-            payload = txt_steg.txt_steg(WORKING_PATH + file.filename, b2c).decode()
-            session["payload"] = payload
-            session["txt"] = file.filename
+            file_extension = os.path.splitext(file.filename)[1]
+            if file_extension == ".png" or file_extension == ".bmp":
+                payload = img_steg.img_steg(WORKING_PATH + file.filename, b2c).decode()
+                session["payload"] = payload
+                session["image"] = file.filename
+            elif file_extension == ".wav":
+                payload = wav_steg.wav_steg(WORKING_PATH + file.filename, b2c).decode()
+                session["payload"] = payload
+                session["wav"] = file.filename
+            elif file_extension == ".txt":
+                payload = txt_steg.txt_steg(WORKING_PATH + file.filename, b2c).decode()
+                session["payload"] = payload
+                session["txt"] = file.filename
 
-    return redirect("/decode_result")
+        return redirect("/decode_result")
+    except:
+        return redirect("/unsupported")
 
 @app.route('/decode_result')
 def decode_result():
@@ -104,6 +110,10 @@ def decode_result():
     else:
         return redirect("/decode")
 
+@app.route('/unsupported')
+def unsupported():
+    return render_template('unsupported.html')
+
 @app.route('/get_session')
 def get_session():
     session_data = dict(session)
diff --git a/Application/views/decode.html b/Application/views/decode.html
index a6dfd62..fb0f64c 100644
--- a/Application/views/decode.html
+++ b/Application/views/decode.html
@@ -8,6 +8,11 @@
     <title>Decode</title>
     <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.4/jquery.min.js"></script>
     <style>
+        * {
+            padding: 0px;
+            margin: 0px;
+        }
+
         .drop-zone {
             background-color: #f8f8f8;
             border: 2px dashed #cccccc;
@@ -55,7 +60,8 @@
             color: white;
             cursor: pointer;
         }
-        table{
+
+        table {
             width: 400px;
             margin: 10px auto;
         }
@@ -63,8 +69,10 @@
 </head>
 
 <body>
+    <a style="text-decoration: none; color: white; display: inline-block; padding: 14px 16px; background-color: gray;" href="/">< Back</a>
+
     <div class="form-container">
-        <form action="/decoding" method="POST" enctype = "multipart/form-data">
+        <form action="/decoding" method="POST" enctype="multipart/form-data">
             <div class="drop-zone" id="dropZone">
                 <div class="upload-icon">&#8681;</div>
                 <div class="upload-text">Drag and drop an image here or click to browse</div>
diff --git a/Application/views/decode_result.html b/Application/views/decode_result.html
index 23b701b..6b04636 100644
--- a/Application/views/decode_result.html
+++ b/Application/views/decode_result.html
@@ -8,6 +8,7 @@
     <title>RESULT</title>
 </head>
 <body>
+    <a style="text-decoration: none; color: white; display: inline-block; padding: 14px 16px; background-color: gray;" href="/decode">< Back</a>
 </body>
 <script>
 
@@ -16,29 +17,29 @@
         $.get('/get_session', function(response) {
             if(response.hasOwnProperty("image")){
                 console.log(response)
-                var html_content = `<section>
-                    <div>
-                        <h1>Decoded</h1>
+                var html_content = `<section style="margin: 100px auto; width:50%; height:50%; text-align:center;">
+                    <div style="width:100%; height:100%; text-align:center;">
+                        <h1 style="height:15%; width:90%; padding: 5%">Decoded</h1>
                         <img src="upload/` + response["image"] + `" alt="Image Not Found">
                     </div>
-                    <div>
-                        <h1>Secret Text:</h1>
-                        <p>` + response["payload"] + `</p>
+                    <div style="width:100%; height:100%; text-align:center;">
+                        <h1 style="height:15%; width:90%; padding: 5%">Secret Text:</h1>
+                        <p style="color: red">` + response["payload"] + `</p>
                     </div>
                 </section>`
                 $("body").append(html_content)
             }
             else if(response.hasOwnProperty("wav")){
-                var html_content = `<section>
-                <h1>Decoded</h1>
-                <audio controls>
-                    <source src="upload/` + response["wav"] + `" type="audio/wav">
-                    Your browser does not support the audio element.
-                </audio>
-                <div>
-                    <h1>Secret Text:</h1>
-                    <p>` + response["payload"] + `</p>
-                </div>
+                var html_content = `<section style="margin: 100px auto; width:50%; height:50%; text-align:center;">
+                    <h1 style="height:15%; width:90%; padding: 5%">Decoded</h1>
+                    <audio controls>
+                        <source src="upload/` + response["wav"] + `" type="audio/wav">
+                        Your browser does not support the audio element.
+                    </audio>
+                    <div>
+                        <h1 style="height:15%; width:90%; padding: 5%">Secret Text:</h1>
+                        <p>` + response["payload"] + `</p>
+                    </div>
                 </section>`
                 $("body").append(html_content)
             }
@@ -46,13 +47,13 @@
                 fetch("upload/" + response["txt"])
                     .then(res => res.text())
                     .then(data => {
-                        var html_content = `<section>
-                            <div>
-                                <h1>Decoded</h1>
-                                <textarea>` + data + `</textarea>
+                        var html_content = `<section style="margin: 100px auto; width:50%; height:50%; text-align:center;">
+                            <div style="width:100%; height:100%; text-align:center;">
+                                <h1 style="height:15%; width:90%; padding: 5%">Decoded</h1>
+                                <textarea style="height:75%; width:90%; padding: 5%">` + data + `</textarea>
                             </div>
-                            <div>
-                                <h1>Secret Text:</h1>
+                            <div style="width:100%; height:100%; text-align:center;">
+                                <h1 style="height:15%; width:90%; padding: 5%">Secret Text:</h1>
                                 <p>` + response["payload"] + `</p>
                             </div>
                         </section>`
diff --git a/Application/views/encode.html b/Application/views/encode.html
index b65b15b..7101e4b 100644
--- a/Application/views/encode.html
+++ b/Application/views/encode.html
@@ -8,6 +8,11 @@
     <title>Encode</title>
     <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.4/jquery.min.js"></script>
     <style>
+        *{
+            padding: 0px;
+            margin: 0px;
+        }
+
         .drop-zone {
             background-color: #f8f8f8;
             border: 2px dashed #cccccc;
@@ -65,6 +70,8 @@
 </head>
 
 <body>
+    <a style="text-decoration: none; color: white; display: inline-block; padding: 14px 16px; background-color: gray;" href="/">< Back</a>
+
     <div class="form-container">
         <form action="/encoding" method="POST" enctype = "multipart/form-data">
             <div class="drop-zone" id="dropZone">
diff --git a/Application/views/encode_result.html b/Application/views/encode_result.html
index 3f28603..0a0f91d 100644
--- a/Application/views/encode_result.html
+++ b/Application/views/encode_result.html
@@ -6,8 +6,20 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
     <title>RESULT</title>
+    <style>
+        *{
+            padding: 0px;
+            margin: 0px;
+        }
+
+        html, body{
+            width: 100%;
+            height: 100%;
+        }
+    </style>
 </head>
 <body>
+    <a style="text-decoration: none; color: white; display: inline-block; padding: 14px 16px; background-color: gray;" href="/encode">< Back</a>
 </body>
 <script>
 
@@ -16,13 +28,13 @@
         $.get('/get_session', function(response) {
             if(response.hasOwnProperty("image")){
                 console.log(response)
-                var html_content = `<section style="display: flex; justify-content: flex-start;">
-                    <div>
-                        <h1>Original</h1>
+                var html_content = `<section style="margin: 100px auto; width:50%; height:50%; display: flex; justify-content: space-between;">
+                    <div style="border: 1px solid black; width:100%; height:100%; text-align:center;">
+                        <h1 style="height:15%; width:90%; padding: 5%">Original</h1>
                         <img src="upload/` + response["image"] + `" alt="Image Not Found">
                     </div>
-                    <div>
-                        <h1>Encoded</h1>
+                    <div style="border: 1px solid black; width:100%; height:100%; text-align:center;">
+                        <h1 style="height:15%; width:90%; padding: 5%">Encoded</h1>
                         <img src="upload/` + response["image2"] + `" alt="Image Not Found">
                     </div>
 
@@ -30,16 +42,16 @@
                 $("body").append(html_content)
             }
             else if(response.hasOwnProperty("wav")){
-                var html_content = `<section style="display: flex; justify-content: flex-start;">
-                <div>
-                    <h1>Original</h1>
+                var html_content = `<section style="margin: 100px auto; width:50%; height:50%; display: flex; justify-content: space-between;">
+                    <div style="border: 1px solid black; width:100%; height:100%; text-align:center;">
+                    <h1 style="height:15%; width:90%; padding: 5%">Original</h1>
                     <audio controls>
                         <source src="upload/` + response["wav"] + `" type="audio/wav">
                         Your browser does not support the audio element.
                     </audio>
                 </div>
-                <div>
-                    <h1>Encoded</h1>
+                <div style="border: 1px solid black; width:100%; height:100%; text-align:center;">
+                    <h1 style="height:15%; width:90%; padding: 5%">Encoded</h1>
                     <audio controls>
                         <source src="upload/` + response["wav2"] + `" type="audio/wav">
                         Your browser does not support the audio element.
@@ -56,14 +68,14 @@
                         fetch("upload/" + response["txt2"])
                         .then(res2 => res2.text())
                         .then(data2 => {
-                            var html_content = `<section style="display: flex; justify-content: flex-start;">
-                                <div>
-                                    <h1>Original</h1>
-                                    <textarea>` + data + `</textarea>
+                            var html_content = `<section style="margin: 100px auto; width:50%; height:50%; display: flex; justify-content: space-between;">
+                                <div style="border: 1px solid black; width:100%; height:100%; text-align:center;">
+                                    <h1 style="height:15%; width:90%; padding: 5%">Original</h1>
+                                    <textarea style="height:77%; width:100%">` + data + `</textarea>
                                 </div>
-                                <div>
-                                    <h1>Encoded</h1>
-                                    <textarea>` + data2 + `</textarea>
+                                <div style="border: 1px solid black; width:100%; height:100%; text-align:center;">
+                                    <h1 style="height:15%; width:90%; padding: 5%">Encoded</h1>
+                                    <textarea style="height:77%; width:100%">` + data2 + `</textarea>
                                 </div>
 
                             </section>`
diff --git a/Application/views/unsupported.html b/Application/views/unsupported.html
new file mode 100644
index 0000000..9b77b16
--- /dev/null
+++ b/Application/views/unsupported.html
@@ -0,0 +1,67 @@
+<!DOCTYPE html>
+<html>
+
+<head>
+    <title>File Unsupported</title>
+    <style>
+        body {
+            font-family: Arial, sans-serif;
+            background-color: #f2f2f2;
+            margin: 0;
+            padding: 0;
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            height: 100vh;
+        }
+
+        .container {
+            text-align: center;
+            background-color: #fff;
+            padding: 30px;
+            border-radius: 5px;
+            box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
+        }
+
+        h1 {
+            color: #333;
+            font-size: 28px;
+            margin-bottom: 20px;
+        }
+
+        p {
+            color: #777;
+            font-size: 18px;
+            margin-bottom: 30px;
+        }
+
+        .icon {
+            width: 120px;
+            height: 120px;
+            border-radius: 50%;
+            background-color: red;
+            margin: 0px auto;
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            font-size: 60px;
+            color: white;
+            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.4);
+        }
+
+        .icon::before {
+            content: "X";
+        }
+    </style>
+</head>
+
+<body>
+    <div class="container">
+        <h1>File Unsupported</h1>
+        <p>We're sorry, but the file format you uploaded is not supported.</p>
+        <div class="icon"></div>
+        <a style="text-decoration: none; color: black; display: inline-block; margin: 20px 0px 0px; padding: 14px 16px;" href="#" onclick="history.back()">< Back</a>
+    </div>
+</body>
+
+</html>
\ No newline at end of file