Fix typo in nassim template

Author: afshinm

themes/introjs-nassim.css

@@ -160,7 +160,7 @@
   background: transparent;
   text-decoration: none;
   font: 11px/normal sans-serif;
-  color: ##2980b9 !important;
+  color: #2980b9 !important;
   white-space: nowrap;
   cursor: pointer;
   outline: none !important;
@@ -285,4 +285,4 @@
   width: 0;
   left: 50%;
   top: 50%;
-}
+}