diff --git a/packages/block-library/src/post-content/block.json b/packages/block-library/src/post-content/block.json
index 5ca3892f567a54..1b9de707cb3220 100644
--- a/packages/block-library/src/post-content/block.json
+++ b/packages/block-library/src/post-content/block.json
@@ -54,5 +54,6 @@
 			}
 		}
 	},
+	"style": "wp-block-post-content",
 	"editorStyle": "wp-block-post-content-editor"
 }
diff --git a/packages/block-library/src/post-content/style.scss b/packages/block-library/src/post-content/style.scss
new file mode 100644
index 00000000000000..96e27d04679d44
--- /dev/null
+++ b/packages/block-library/src/post-content/style.scss
@@ -0,0 +1,5 @@
+.wp-block-post-content::after {
+	content: "";
+	display: table;
+	clear: both;
+}
diff --git a/packages/block-library/src/style.scss b/packages/block-library/src/style.scss
index 790e09535f4b69..7e33c65e70abc9 100644
--- a/packages/block-library/src/style.scss
+++ b/packages/block-library/src/style.scss
@@ -29,6 +29,7 @@
 @import "./paragraph/style.scss";
 @import "./post-author/style.scss";
 @import "./post-comments-form/style.scss";
+@import "./post-content/style.scss";
 @import "./post-date/style.scss";
 @import "./post-excerpt/style.scss";
 @import "./post-featured-image/style.scss";