impl fade-in animation

src/App/styles.less

@@ -5,6 +5,7 @@
 @import (reference) '~@stremio/stremio-colors/less/stremio-colors.less';
 
 :global {
+    @import (once, less) '~stremio/common/animations.less';
     @import (once, less) '~stremio-router/styles.css';
 }
 

src/common/animations.less

@@ -0,0 +1,20 @@
+:global(.animation-fade-in) {
+    :local {
+        animation-name: fade-in;
+    }
+
+    animation-timing-function: ease-in-out;
+    animation-duration: 100ms;
+}
+
+@keyframes fade-in {
+    0% {
+        opacity: 0.6;
+        transform: translateY(0.2vh);
+    }
+
+    100% {
+        opacity: 1;
+        transform: translateY(0);
+    }
+}