Camille Davis
--- a/core/modules/toolbar/css/toolbar.theme.css
+++ b/core/modules/toolbar/css/toolbar.theme.css
+  top: -1px;
+  height: calc(100% + 2px);
+}
+.toolbar-tray-vertical a:focus::after,
+.toolbar-tray-vertical button:focus::after {
+  top: 0;
+  left: 0; /* LTR */
+  width: 100%;
+  height: calc(100% + 1px);
+}
+[dir="rtl"] .toolbar-tray-vertical a:focus::after,
+[dir="rtl"] .toolbar-tray-vertical button:focus::after {
+  right: 0;
+  left: auto;
+}
+.toolbar-tray-vertical .toolbar-menu-administration > .toolbar-menu > .menu-item:not(:first-child) > a:focus::after,
--- a/core/themes/claro/css/theme/toolbar.theme.pcss.css
+++ b/core/themes/claro/css/theme/toolbar.theme.pcss.css
+  box-shadow: inset 0 0 0 var(--focus-border-size) var(--color-focus), inset 0 0 0 calc(var(--focus-border-size) + var(--focus-border-offset-size)) var(--color-white);
+}
+.toolbar-tray-horizontal a:focus::after,
+.toolbar-tray-horizontal button:focus::after {
+  left: -1px; /* LTR */
+  width: calc(100% + 2px);
+}
+[dir="rtl"] .toolbar-tray-horizontal a:focus::after,
+[dir="rtl"] .toolbar-tray-horizontal button:focus::after {
+  right: -1px;
+  left: auto;
+}
+.toolbar-tray-horizontal .toolbar-toggle-orientation button:focus::after {
+  width: calc(100% + 1px);
+}
+.toolbar-tray-horizontal .toolbar-menu-administration > .toolbar-menu > .menu-item > a:focus::after,