diff --git a/theme/boost/templates/header.mustache b/theme/boost/templates/header.mustache
index 44a50674a0d..cd72ee6cf91 100644
--- a/theme/boost/templates/header.mustache
+++ b/theme/boost/templates/header.mustache
@@ -32,7 +32,7 @@
 }}
 <header id="page-header" class="row">
     <div class="col-12 pt-3 pb-3">
-        <div class="card {{^contextheader}}border-0{{/contextheader}}">
+        <div class="card {{^contextheader}}border-0 bg-transparent{{/contextheader}}">
             <div class="card-body {{^contextheader}}p-2{{/contextheader}}">
                 <div class="d-flex">
                     {{#contextheader}}