add back scanning animation

frontend/src/index.css

@@ -2,6 +2,33 @@
 @tailwind components;
 @tailwind utilities;
 
+/* Image Scanning animation */
+.scanning::after {
+  content: "";
+  position: absolute;
+  top: 0px;
+  left: 0px;
+  width: 5px;
+  height: 100%;
+  background-image: linear-gradient(
+    to right,
+    rgba(19, 161, 14, 0.2),
+    /* Darker matrix green with full transparency */ rgba(19, 161, 14, 0.8)
+      /* The same green with 80% opacity */
+  );
+  animation: scanning 3s ease-in-out infinite;
+}
+
+@keyframes scanning {
+  0%,
+  100% {
+    transform: translateX(0px);
+  }
+  50% {
+    transform: translateX(340px);
+  }
+}
+
 @layer base {
   :root {
     --background: 0 0% 100%;