diff --git a/src/core_plugins/markdown_vis/public/github_markdown.less b/src/core_plugins/markdown_vis/public/github_markdown.less
index 330fa0477e517..c0ab4075db593 100644
--- a/src/core_plugins/markdown_vis/public/github_markdown.less
+++ b/src/core_plugins/markdown_vis/public/github_markdown.less
@@ -299,6 +299,7 @@
 }
 
 .markdown-body blockquote {
+  font-size: 1em;
   padding: 0 1em;
   color: @globalColorDarkGray;
   border-left: 0.25em solid @globalColorLightGray;