fix style problem

Author: Guiny-Time

themes/butterfly/source/css/_page/flink.styl

@@ -12,7 +12,7 @@
         float: left
         overflow: hidden
         margin: 15px 7px
-        width: calc(100% / 3.5  + 10px)
+        width: calc(100% / 3.5  - 10px)
         height: 90px
         border-radius: 8px
         line-height: 17px