remove unsetting notebook work area / viewport padding

Author: andrii-i

packages/notebook-extension/style/base.css

@@ -140,7 +140,6 @@ body[data-format='mobile'] .jp-ToolbarButton .jp-DebuggerBugButton {
 body[data-notebook='notebooks'] .jp-WindowedPanel-viewport {
   background: var(--jp-layout-color0);
   box-shadow: var(--jp-elevation-z4);
-  padding: unset;
 
   /* Extra padding at the top and bottom so the notebook looks nicer */
   padding-top: calc(2 * var(--jp-notebook-padding));