fix:header background color set completely

- append width:100% in notion-h

Author: kych0912

packages/react-notion-x/src/styles.css

@@ -493,6 +493,7 @@
   max-width: 100%;
   white-space: pre-wrap;
   word-break: break-word;
+  width:100%;
 }
 
 .notion-h1 {