fix microsoft#223320 (microsoft#223446)

Author: sandy081

src/vs/base/browser/ui/toggle/toggle.css

@@ -52,6 +52,12 @@
 .monaco-action-bar .checkbox-action-item {
 	display: flex;
 	align-items: center;
+	border-radius: 2px;
+	padding-right: 2px;
+}
+
+.monaco-action-bar .checkbox-action-item:hover {
+	background-color: var(--vscode-toolbar-hoverBackground);
 }
 
 .monaco-action-bar .checkbox-action-item > .monaco-custom-toggle.monaco-checkbox {