diff --git a/src/stylus/core.styl b/src/stylus/core.styl
index 1288f75..c593af1 100644
--- a/src/stylus/core.styl
+++ b/src/stylus/core.styl
@@ -78,12 +78,12 @@ html,body
 			border-left solid var(--syntax-bpx) var(--syntax-ledg)
 			display flex
 
-		.highlight, form, ul, ol, p, details
+		.highlight, form, ul, ol, p
 			margin-top 1em
 			margin-bottom 0.25em
 			&:first-child { margin-top: 0 }
 
-		h1, h2, h3, h4, h5, h6
+		h1, h2, h3, h4, h5, h6, details
 			margin-top 2em
 			margin-bottom 0.25em