diff --git a/doc/source/themes/agogo/static/agogo.css_t b/doc/source/themes/agogo/static/agogo.css_t
index 2ff4abad..f47167c0 100644
--- a/doc/source/themes/agogo/static/agogo.css_t
+++ b/doc/source/themes/agogo/static/agogo.css_t
@@ -23,6 +23,7 @@ div.header-wrapper {
 
 body {
   font-family: {{ theme_bodyfont }};
+  font-size: 10pt;
   line-height: 1.4em;
   color: black;
   background-color: {{ theme_bgcolor }};