Fix missing `.btn` class from `bd-search-docs-toggler`. (#23942)

diff --git a/_includes/docs-sidebar.html b/_includes/docs-sidebar.html
index 00eaf47a60d78f3cc25ce069243e4cd2bc1f38ba..d23e033b669a95c5d20034febf78ddef9e8de58c 100644 (file)
--- a/_includes/docs-sidebar.html
+++ b/_includes/docs-sidebar.html
@@ -1,6 +1,6 @@
 <form class="bd-search d-flex align-items-center">
   <input type="search" class="form-control" id="search-input" placeholder="Search..." aria-label="Search for..." autocomplete="off">
-  <button class="btn-link bd-search-docs-toggle d-md-none p-0 ml-3" type="button" data-toggle="collapse" data-target="#bd-docs-nav" aria-controls="bd-docs-nav" aria-expanded="false" aria-label="Toggle docs navigation">
+  <button class="btn btn-link bd-search-docs-toggle d-md-none p-0 ml-3" type="button" data-toggle="collapse" data-target="#bd-docs-nav" aria-controls="bd-docs-nav" aria-expanded="false" aria-label="Toggle docs navigation">
     {% include icons/menu.svg class="" width="30" height="30" %}
   </button>
 </form>