Merge branch 'pr-1860'

Author: friuns3

source/_base.css

@@ -73,3 +73,14 @@
     opacity: 0;
   }
 }
+@keyframes color-blink {
+  0% { color: red; }
+  50% { color: yellow; }
+  100% { color: red; }
+}
+
+.color-blink {
+  animation-name: color-blink;
+  animation-duration: 1s;
+  animation-iteration-count: infinite;
+}