Adjust footnote marker size and improve HR divider styling in asciidoctor-anywhere-footnote stylesheet.

Author: RayOffiah

src/css/asciidoctor-anywhere-footnote.css

@@ -1,6 +1,6 @@
 .anywhere-footnote-marker {
   vertical-align: super;
-  font-size: 75%;
+  font-size: 90%;
   text-decoration: none;
 }
 
@@ -9,9 +9,10 @@
   text-decoration: none;
 }
 
-hr.footnote-separator {
-  margin-left: 0;
-  margin-right: auto;
-  margin-bottom: 10px;
-  width: 100px;
+.anywhere-footnote-hr-divider {
+  height: 1px;
+  background-color: #ccc; /* Standard gray color similar to default HR */
+  border: none;
+  margin: 0.5em 0; /* Standard HR margin */
+  width: 40%;
 }