diff --git a/README.md b/README.md
index 9d1c80f..491bb61 100644
--- a/README.md
+++ b/README.md
@@ -60,6 +60,8 @@ Visit the [Settings wiki](https://github.com/nairobilug/pelican-alchemy/wiki/Set
 - **PYGMENTS_STYLE**: Built-in Pygments style for syntax highlighting.
 - **HIDE_AUTHORS**: Hide the author(s) of an article - useful for single author sites.
 - **RFG_FAVICONS**: Use a Favicon Generator package.
+- **THEME_CSS_OVERRIDES**: Sequence of stylesheet URLs to override CSS provided by theme.
+  Both relative and absolute URLs are supported.
 
 Misc settings:
 
diff --git a/alchemy/templates/base.html b/alchemy/templates/base.html
index 97e323a..ba8b07a 100644
--- a/alchemy/templates/base.html
+++ b/alchemy/templates/base.html
@@ -21,6 +21,13 @@
   <link rel="stylesheet" href="{{ SITEURL }}/theme/css/font-awesome.min.css">
   <link rel="stylesheet" href="{{ SITEURL }}/theme/css/pygments/{{ PYGMENTS_STYLE|default('default') }}.min.css">
   <link rel="stylesheet" href="{{ SITEURL }}/theme/css/theme.css">
+  {% for stylesheet in THEME_CSS_OVERRIDES or () %}
+  {% if stylesheet|lower|truncate(4, True, '') == 'http' %}
+  <link rel="stylesheet" href="{{ stylesheet }}">
+  {% else %}
+  <link rel="stylesheet" href="{{ SITEURL + '/' + stylesheet }}">
+  {% endif %}
+  {% endfor %}
 
   {% include 'include/xml_feeds.html' %}
   {% block head %}{% endblock %}