set same y spacing on h1

Author: pettinarip

src/layouts/Docs.tsx

@@ -98,7 +98,7 @@ const H1 = (props: HeadingProps) => (
     {...baseHeadingStyle}
     fontSize={{ base: "2rem", md: "2.5rem" }}
     mt={{ base: 0, md: 8 }}
-    mb={{ base: 4, md: 8 }}
+    mb="8"
     {...props}
   />
 )