diff --git a/wagtail/wagtailadmin/static/wagtailadmin/scss/components/typography.scss b/wagtail/wagtailadmin/static/wagtailadmin/scss/components/typography.scss
index 1b7e36324..059392aaf 100644
--- a/wagtail/wagtailadmin/static/wagtailadmin/scss/components/typography.scss
+++ b/wagtail/wagtailadmin/static/wagtailadmin/scss/components/typography.scss
@@ -56,7 +56,6 @@ kbd{
 /* Help text formatters */
 
 .help-block{
-    float:left;
     padding:1em;
     margin:1em 0;
     clear:both;
diff --git a/wagtail/wagtailadmin/templates/wagtailadmin/page_privacy/set_privacy.html b/wagtail/wagtailadmin/templates/wagtailadmin/page_privacy/set_privacy.html
index 6298d6f5f..263908a26 100644
--- a/wagtail/wagtailadmin/templates/wagtailadmin/page_privacy/set_privacy.html
+++ b/wagtail/wagtailadmin/templates/wagtailadmin/page_privacy/set_privacy.html
@@ -3,7 +3,7 @@
 {% include "wagtailadmin/shared/header.html" with title=title_str icon="locked" %}
 
 <div class="nice-padding">
-    <p>{% trans "<b>Note:</b> privacy changes apply to all children of this page too." %}</p>
+    <p class="help-block help-warning">{% trans "Privacy changes apply to all children of this page too." %}</p>
     <form action="{% url 'wagtailadmin_pages_set_privacy' page.id %}" method="POST">
         {% csrf_token %}
         <ul class="fields">