diff -Nur a/docs/source/_themes/metrics/layout.html b/docs/source/_themes/metrics/layout.html
--- a/docs/source/_themes/metrics/layout.html	2015-04-26 11:55:19.000000000 +0800
+++ b/docs/source/_themes/metrics/layout.html	2023-08-02 15:17:19.255362367 +0800
@@ -19,7 +19,7 @@
     {%- for cssfile in css_files %}
     <link rel="stylesheet" href="{{ pathto(cssfile, 1) }}" type="text/css"/>
     {%- endfor %}
-    <link rel="stylesheet" href="{{ pathto('_static/' + style, 1) }}" type="text/css"/>
+    <link rel="stylesheet" href="{{ pathto('_static/', styles) }}" type="text/css"/>
     {%- if favicon %}
     <link rel="shortcut icon" href="{{ pathto('_static/' + favicon, 1) }}"/>
     {%- endif %}