diff --git a/packages/react-devtools-shared/src/devtools/views/Components/SelectedElement.css b/packages/react-devtools-shared/src/devtools/views/Components/SelectedElement.css
index eaf5ac4a33a3c..377a428e96cfc 100644
--- a/packages/react-devtools-shared/src/devtools/views/Components/SelectedElement.css
+++ b/packages/react-devtools-shared/src/devtools/views/Components/SelectedElement.css
@@ -16,10 +16,37 @@
   padding: 0.5rem;
 }
 
+.Key {
+  flex: 0 1 auto;
+  padding-left: 0.25rem;
+  padding-right: 0.125rem;
+  line-height: 1rem;
+  border-top-left-radius: 0.125rem;
+  border-bottom-left-radius: 0.125rem;
+  display: inline-block;
+  background-color: var(--color-component-badge-background);
+  color: var(--color-text);
+  font-family: var(--font-family-monospace);
+  font-size: var(--font-size-monospace-small);
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  max-width: 100%;
+}
+
+.KeyArrow {
+  height: 1rem;
+  width: 1rem;
+  margin-right: -0.25rem;
+  border: 0.5rem solid transparent;
+  border-left: 0.5rem solid var(--color-component-badge-background);
+}
+
 .SelectedComponentName {
   flex: 1 1 auto;
   overflow: hidden;
   text-overflow: ellipsis;
+  line-height: normal;
 }
 
 .Owners {