diff --git a/packages/block-library/src/post-template/block.json b/packages/block-library/src/post-template/block.json
index 6a575855583527..722a27f5d2f925 100644
--- a/packages/block-library/src/post-template/block.json
+++ b/packages/block-library/src/post-template/block.json
@@ -42,6 +42,8 @@
 			}
 		},
 		"spacing": {
+			"margin": true,
+			"padding": true,
 			"blockGap": {
 				"__experimentalDefault": "1.25em"
 			},
@@ -51,6 +53,18 @@
 		},
 		"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-template",
diff --git a/packages/block-library/src/post-template/editor.scss b/packages/block-library/src/post-template/editor.scss
index 7b426b0f3d37a5..1adeee4b1c13e1 100644
--- a/packages/block-library/src/post-template/editor.scss
+++ b/packages/block-library/src/post-template/editor.scss
@@ -3,5 +3,6 @@
 		padding-left: 0;
 		margin-left: 0;
 		list-style: none;
+		box-sizing: border-box;
 	}
 }
diff --git a/packages/block-library/src/post-template/style.scss b/packages/block-library/src/post-template/style.scss
index 806aadc77470eb..7dce26dcd6a26b 100644
--- a/packages/block-library/src/post-template/style.scss
+++ b/packages/block-library/src/post-template/style.scss
@@ -4,6 +4,7 @@
 	max-width: 100%;
 	list-style: none;
 	padding: 0;
+	box-sizing: border-box;
 
 	// These rules no longer apply but should be kept for backwards compatibility.
 	&.is-flex-container {