diff --git a/_mixins.sass b/_mixins.sass
index 9204ee1..20b5117 100644
--- a/_mixins.sass
+++ b/_mixins.sass
@@ -70,3 +70,16 @@
     duration: $speed
     iteration-count: $iteration
     timing-function: linear
+    
+@mixin animationOpacity($speed: 1s, $iteration: infinite)
+  $id: unique-id()
+  @keyframes #{$id}
+      from
+        opacity: 0
+      to
+        opacity: 1
+  animation:
+    name: $id
+    duration: $speed
+    iteration-count: $iteration
+    timing-function: linear