diff -NaurdwB -I ^#[[:space:]]* ./docs/users_guide/rtd-theme/layout.html ./docs/users_guide/rtd-theme/layout.html
--- ./docs/users_guide/rtd-theme/layout.html	2026-01-28 08:32:19
+++ ./docs/users_guide/rtd-theme/layout.html	2026-01-28 08:33:22
@@ -32,7 +32,7 @@
     {%- if css|attr("rel") %}
       <link rel="{{ css.rel }}" href="{{ pathto(css.filename, 1) }}" type="text/css"{% if css.title is not none %} title="{{ css.title }}"{% endif %} />
     {%- else %}
-      <link rel="stylesheet" href="{{ pathto(css, 1) }}" type="text/css" />
+      <link rel="stylesheet" href="{{ pathto(css.filename, 1) }}" type="text/css" />
     {%- endif %}
   {%- endfor %}
 
