Typo css symbol

Author: Tina C Lin (RD-TW)

src/index.styl

@@ -247,7 +247,7 @@
     transition: all .2s linear 0s
 
     &:active,
-    $.active {
+    &.active {
         color: #222;
         background-color: #eee;
         background-image: none;