Adjusted separator size in anywhere footnote.

Author: RayOffiah

src/css/asciidoctor-anywhere-footnote.css

@@ -14,5 +14,5 @@
   background-color: #ccc; /* Standard gray color similar to default HR */
   border: none;
   margin: 0.5em 0; /* Standard HR margin */
-  width: 40%;
+  width: 20%;
 }