Added padding around gray box of ` markdown

Added padding of 1px from top and bottom and 5px from left and right
around gray box of single ` markdown.

Signed-off-by: Ondrej <o.jariabka@gmail.com>

notebook/static/notebook/less/renderedhtml.less

@@ -46,10 +46,14 @@
 
     pre {
         margin: 1em 2em;
+        padding: 0px;
         background-color: @body-bg;
     }
 
-    code {background-color: #eff0f1;}
+    code {
+        background-color: #eff0f1;
+        padding: 1px 5px;
+    }
 
     pre code {background-color: @body-bg;}
 
@@ -57,7 +61,6 @@
         border:             0;
         color:              @text-color;
         font-size:          100%;
-        padding:            0px;
     }
 
     blockquote {margin: 1em 2em;}