diff --git a/css/skeleton-auto.css b/css/skeleton-auto.css
index f1e8a36..5f16103 100644
--- a/css/skeleton-auto.css
+++ b/css/skeleton-auto.css
@@ -297,3 +297,18 @@ hr {
   }
 }
 
+.fadein {
+    animation-name: fadein;
+    animation-duration: 3s;
+    animation-fill-mode: both;
+  }
+
+@keyframes fadein {
+  from {
+    opacity: 0;
+  }
+
+  to {
+    opacity: 1;
+  }
+}