Style scrollbar (#82)

* Style scrollbar

* Restore main scrollbar

Author: trungleduc

style/base.css

@@ -148,6 +148,23 @@
   opacity: 0.5;
 }
 
+.glue-sidepanel-widget *::-webkit-scrollbar,
+.glue-Session-gridhost *::-webkit-scrollbar {
+  width: 8px;
+  background: transparent;
+}
+
+.glue-sidepanel-widget *::-webkit-scrollbar-track,
+.glue-Session-gridhost *::-webkit-scrollbar-track {
+  border: solid 3px transparent;
+}
+
+.glue-sidepanel-widget *::-webkit-scrollbar-thumb,
+.glue-Session-panel *::-webkit-scrollbar-thumb {
+  box-shadow: inset 0 0 10px 10px var(--jp-layout-color3);
+  border: 3px solid transparent;
+}
+
 .grid-stack-item-content {
   color: var(--jp-content-font-color1);
   background-color: var(--jp-layout-color1);
@@ -169,6 +186,11 @@
   border-radius: 5px;
 }
 
+.glue-item .ui-resizable-handle.ui-resizable-e {
+  width: 5px !important;
+  right: -2px !important;
+}
+
 .grid-item-toolbar-spacer {
   flex-grow: 1;
   flex-shrink: 1;