fix: add back removed .centered class

frappe/public/scss/common/global.scss

@@ -129,3 +129,11 @@ html.firefox, html.safari {
 	}
 }
 
+.centered {
+	position: absolute;
+	top: 50%;
+	left: 50%;
+	transform: translate(-50%, -50%);
+	-webkit-transform: translate(-50%, -50%);
+}
+