diff --git a/packages/block-library/src/post-author-name/block.json b/packages/block-library/src/post-author-name/block.json
index 31874ddbf9bc5..68d2c49bd9105 100644
--- a/packages/block-library/src/post-author-name/block.json
+++ b/packages/block-library/src/post-author-name/block.json
@@ -53,6 +53,19 @@
 		},
 		"interactivity": {
 			"clientNavigation": true
+		},
+		"__experimentalBorder": {
+			"radius": true,
+			"color": true,
+			"width": true,
+			"style": true,
+			"__experimentalDefaultControls": {
+				"radius": true,
+				"color": true,
+				"width": true,
+				"style": true
+			}
 		}
-	}
+	},
+	"style": "wp-block-post-author-name"
 }
diff --git a/packages/block-library/src/post-author-name/style.scss b/packages/block-library/src/post-author-name/style.scss
new file mode 100644
index 0000000000000..0f57b30490fa6
--- /dev/null
+++ b/packages/block-library/src/post-author-name/style.scss
@@ -0,0 +1,4 @@
+.wp-block-post-author-name {
+	// This block has customizable padding, border-box makes that more predictable.
+	box-sizing: border-box;
+}
diff --git a/packages/block-library/src/style.scss b/packages/block-library/src/style.scss
index 86fe5a3eefaba..338753ae53fcb 100644
--- a/packages/block-library/src/style.scss
+++ b/packages/block-library/src/style.scss
@@ -40,6 +40,7 @@
 @import "./post-terms/style.scss";
 @import "./post-time-to-read/style.scss";
 @import "./post-title/style.scss";
+@import "./post-author-name/style.scss";
 @import "./preformatted/style.scss";
 @import "./pullquote/style.scss";
 @import "./post-template/style.scss";