Add some styling for in-page links

src/assets/style.scss

@@ -259,6 +259,25 @@ footer {
       }
     }
   }
+
+  // in-page-links
+  article  {
+    a[href^="#"] {
+      color: $alternative-links;
+
+      &:hover {
+        background: $alternative-links-1;
+      }
+
+      &:not(.footnote-ref a):not(.footnote-backref) {
+        &:before {
+          content: '#';
+          padding-right: .3em;
+          opacity: .3
+        }
+      }
+    }
+  }
 }
 
 footer {