Support fading elements with a previously set opacity without flicker

app/stylus/keyframes.styl

@@ -3,17 +3,18 @@
 		opacity: 0;
 		visibility: hidden;
 	}
+
  	to {
-		opacity: 1;
 		visibility: visible;
 	}
 }
- @keyframes fade-out {
+
+@keyframes fade-out {
 	from {
-		opacity: 1;
 		visibility: visible;
 	}
- 	to {
+
+	to {
 		opacity: 0;
 		visibility: hidden;
 	}