Rename ~/.atom/styles.css to ~/.atom/styles.less

dot-atom/styles.less

@@ -3,6 +3,9 @@
  *
  * This stylesheet is loaded when Atom starts up and is reloaded automatically
  * when it is changed.
+ *
+ * If you are unfamiliar with LESS, you can read more about it here:
+ * http://www.lesscss.org
  */
 
 .tree-view {