diff --git a/packages/block-library/src/style.scss b/packages/block-library/src/style.scss
index 790e09535f4b69..5e33980badd76c 100644
--- a/packages/block-library/src/style.scss
+++ b/packages/block-library/src/style.scss
@@ -52,6 +52,7 @@
 @import "./spacer/style.scss";
 @import "./tag-cloud/style.scss";
 @import "./table/style.scss";
+@import "./table-of-contents/style.scss";
 @import "./term-description/style.scss";
 @import "./text-columns/style.scss";
 @import "./verse/style.scss";
diff --git a/packages/block-library/src/table-of-contents/block.json b/packages/block-library/src/table-of-contents/block.json
index 0c9c4bb4a2868d..451d245d867b07 100644
--- a/packages/block-library/src/table-of-contents/block.json
+++ b/packages/block-library/src/table-of-contents/block.json
@@ -48,7 +48,20 @@
 		},
 		"interactivity": {
 			"clientNavigation": true
+		},
+		"__experimentalBorder": {
+			"radius": true,
+			"color": true,
+			"width": true,
+			"style": true,
+			"__experimentalDefaultControls": {
+				"radius": true,
+				"color": true,
+				"width": true,
+				"style": true
+			}
 		}
 	},
-	"example": {}
+	"example": {},
+	"style": "wp-block-table-of-contents"
 }
diff --git a/packages/block-library/src/table-of-contents/style.scss b/packages/block-library/src/table-of-contents/style.scss
new file mode 100644
index 00000000000000..4a3fbb6108bee5
--- /dev/null
+++ b/packages/block-library/src/table-of-contents/style.scss
@@ -0,0 +1,4 @@
+:root :where(.wp-block-table-of-contents) {
+	// This block has customizable padding, border-box makes that more predictable.
+	box-sizing: border-box;
+}