Fix `h6` style
diff --git a/antora-playbook.yaml b/antora-playbook.yaml
index d733f54..ba41067 100644
--- a/antora-playbook.yaml
+++ b/antora-playbook.yaml
@@ -72,12 +72,13 @@
<!-- `@asciidoctor/tabs` extension styles -->
<link rel="stylesheet" href="{{{uiRootPath}}}/css/vendor/tabs.css">
<style>
- /* Default `h4` and `h5` are smaller than the normal text, fix header font sizing: */
+ /* Default `h4`, `h5`, and `h6` are smaller than the normal text, fix header font sizing: */
.doc h1 { font-size: 1.9rem; }
.doc h2 { font-size: 1.7rem; }
.doc h3 { font-size: 1.5rem; font-weight: 400; }
.doc h4 { font-size: 1.3rem; font-weight: 500; }
.doc h5 { font-size: 1.1rem; font-weight: 500; text-decoration: underline; }
+ .doc h6 { font-size: 0.9rem; font-weight: 500; text-decoration: underline; }
/* Default `code`, `pre`, and `.colist` (source code annotations) fonts are too big, adjust them: */
.doc .colist>table code, .doc p code, .doc thead code { font-size: 0.8em; }
.doc pre { font-size: 0.7rem; }
