Update register

@@ -7,6 +7,18 @@
 <link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
 <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Nanum+Gothic:400,700,800&amp;subset=korean">
 <style>body,h1,h2,h3,h4,h5 {font-family: "Nanum+Gothic", sans-serif}</style>
+<style>
+#container {
+    margin: 0px auto;
+    border: 10px #333 solid;
+}
+#videoInput {
+    background-color: #666;
+}
+#canvasOutput {
+    background-color: #666;
+}
+</style>
 <script type='text/javascript' src="{{url_for('static', filename='js/opencv.js')}}"></script>
 <script type='text/javascript' src="{{url_for('static', filename='js/utils.js')}}"></script>
 <script type='text/javascript' src="https://code.jquery.com/jquery-1.12.4.min.js"></script>
@@ -142,7 +154,7 @@ function main()
 function activate_sender()
 {
 	let sender = document.getElementById("sender");
-	fileloader.disabled = false;
+	sender.disabled = false;
 }
 
 function toggle_streaming()
@@ -170,6 +182,16 @@ function submit()
 {
     let student_id = document.getElementById('student_id').value;
     let student_name = document.getElementById('student_name').value;
+    if (b64encoded === '')
+    {
+        alert("얼굴을 먼저 촬영해주세요");
+        return;
+    }
+    if (!(student_id.length && student_name.length))
+    {
+        alert("학번과 이름을 입력해주세요");
+        return;
+    }
     b64encoded = b64encoded.replace('data:image/jpeg;base64,', '')
     $.ajax({
        type: "POST",
@@ -208,7 +230,7 @@ and is wrapped around the whole page content, except for the footer in this exam
             <div>
                 학번: <input type="text" id="student_id"><br>
                 이름: <input type="text" id="student_name"><br><br>
-                <input id="streamButton" type="button" onclick="toggle_streaming()" value="활영중지" disabled>
+                <input id="streamButton" type="button" onclick="toggle_streaming()" value="활영중지">
                 <input id="sender" type="button" onclick="submit()" value="등록" disabled>
             </div>
         </div>