tuning code style

notebook/static/custom/custom.css

@@ -18,4 +18,4 @@ This will always be an empty file in IPython
 
 [dir="rtl"] .fa-step-forward::before {
     content: "\f048";
-}
+}

notebook/static/notebook/less/kernelselector.less

@@ -11,4 +11,4 @@
 
 [dir="rtl"] #kernel_logo_widget {
     .pull-left();
-}
+}

notebook/static/tree/js/main.js

@@ -61,7 +61,7 @@ require([
         console.log("Error loading custom.js from tree service. Continuing and logging");
         console.warn(err);
     }
-    
+
     console.log('Welcome to Project Jupyter! Explore the various tools available and their corresponding documentation. If you are interested in contributing to the platform, please visit the community resources section at http://jupyter.org/community.html.');