style/ui changes

public/index.html

@@ -27,7 +27,9 @@
     <body>
         <noscript>You need to enable JavaScript to run this app.</noscript>
         <div id="app">
-            <img src="%PUBLIC_URL%/logo192.png" alt="Trash Recognizer logo" />
+            <div id="loading-cont" style="text-align: center; display: flex; flex-direction: column; column-gap: 10px; justify-content: center; align-items: center">
+                <img src="%PUBLIC_URL%/logo192.png" alt="Trash Recognizer logo" />
+            </div>
         </div>
         <script src="https://cdn.jsdelivr.net/npm/@tensorflow/tfjs-core"></script>
         <script src="https://cdn.jsdelivr.net/npm/@tensorflow/tfjs-converter"></script>