diff -r 7b1b88e27a20 -r 48c4eec2b7e6 wp/wp-includes/css/classic-themes.css
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/css/classic-themes.css	Fri Sep 05 18:40:08 2025 +0200
@@ -0,0 +1,24 @@
+/**
+ * These rules are needed for backwards compatibility.
+ * They should match the button element rules in the base theme.json file.
+ */
+.wp-block-button__link {
+	color: #ffffff;
+	background-color: #32373c;
+	border-radius: 9999px; /* 100% causes an oval, but any explicit but really high value retains the pill shape. */
+
+	/* This needs a low specificity so it won't override the rules from the button element if defined in theme.json. */
+	box-shadow: none;
+	text-decoration: none;
+
+	/* The extra 2px are added to size solids the same as the outline versions.*/
+	padding: calc(0.667em + 2px) calc(1.333em + 2px);
+
+	font-size: 1.125em;
+}
+
+.wp-block-file__button {
+	background: #32373c;
+	color: #ffffff;
+	text-decoration: none;
+}