Fixed problem with toolbar buttons focus state conflicting with the active state

packages/apputils/style/toolbar.css

@@ -41,6 +41,12 @@
 }
 
 
+.jp-Toolbar-item.jp-Toolbar-button:focus {
+  box-shadow: var(--jp-toolbar-box-shadow);
+  border: 1px solid var(--jp-toolbar-border-color);
+}
+
+
 .jp-Toolbar-button.jp-mod-pressed {
   background-color: var(--jp-layout-color3);
   box-shadow: inset 0 0px 1px rgba(0, 0, 0, 0.5);