css: conclude collapse anim w/ height: auto

Permit the browser to take over height. This should always be
the same value as we animated to, but avoids unpredicted cases
just cutting off part of the heading completely. This has an
impact on changing the font size (but not pixel size) while
the sticky heading is collapsed, for example.

1 files changed, 5 insertions, 1 deletions

diff --git a/src/static/css/site.css b/src/static/css/site.css
index 6aa31c1e..02bd3982 100644
--- a/src/static/css/site.css
+++ b/src/static/css/site.css
@@ -3015,9 +3015,13 @@ main.long-content .content-sticky-heading-container .content-sticky-subheading-r
     height: var(--uncollapsed-heading-height);
   }
 
-  to {
+  99.9% {
     height: var(--collapsed-heading-height);
   }
+
+  to {
+    height: auto;
+  }
 }
 
 .content-sticky-heading-container h1 a {