fix #71140

src/vs/workbench/contrib/callHierarchy/browser/callHierarchyPeek.ts

@@ -157,6 +157,7 @@ export class CallHierarchyTreePeekWidget extends PeekViewWidget {
 		addClass(message, 'message');
 		parent.appendChild(message);
 		this._message = message;
+		this._message.tabIndex = 0;
 
 		const container = document.createElement('div');
 		addClass(container, 'results');
@@ -340,6 +341,7 @@ export class CallHierarchyTreePeekWidget extends PeekViewWidget {
 		this.setMetaTitle('');
 		this._message.innerText = message;
 		this._show();
+		this._message.focus();
 	}
 
 	async showItem(item: CallHierarchyItem): Promise<void> {

src/vs/workbench/contrib/callHierarchy/browser/media/callHierarchy.css

@@ -16,6 +16,7 @@
 	display: inherit;
 	text-align: center;
 	padding-top: 3em;
+	height: 100%;
 }
 
 .monaco-workbench .action-label.calls-to {