diff --git a/doc/_sphinx/theme/flames.css b/doc/_sphinx/theme/flames.css
index a120bb31a..66aace178 100644
--- a/doc/_sphinx/theme/flames.css
+++ b/doc/_sphinx/theme/flames.css
@@ -657,6 +657,7 @@ pre {
   line-height: 125%;
   margin: 0;
   padding: 10px;
+  min-height: 25px;
 }
 
 div[class^="highlight-"] pre:before {