Added new CSS for Pillar environment.

PLR banner.css

@@ -0,0 +1,28 @@
+@-moz-document domain("int.alkemics.com") {
+     :root {
+        --stripe-size: 100px;
+        --color1: #752cf9;
+        --color2: #6723e4;
+        --duration: 30s;
+    }
+    .Navbar::before {
+        z-index: -10;
+        content: "";
+        position: absolute;
+        top: 0;
+        left: 0;
+        width: calc(100% + var(--stripe-size));
+        height: 100%;
+        background: repeating-linear-gradient(-45deg, var(--color2) 25%, var(--color2) 50%, var(--color1) 50%, var(--color1) 75%);
+        background-size: var(--stripe-size) var(--stripe-size);
+        animation: stripeTransform var(--duration) linear infinite;
+    }
+    @keyframes stripeTransform {
+        0% {
+            transform: translateX(0);
+        }
+        100% {
+            transform: translateX(calc(var(--stripe-size) * -1));
+        }
+    }
+}