diff --git a/wagtail/wagtailadmin/static/wagtailadmin/scss/components/formatters.scss b/wagtail/wagtailadmin/static/wagtailadmin/scss/components/formatters.scss
index b391d6166..198c614e4 100644
--- a/wagtail/wagtailadmin/static/wagtailadmin/scss/components/formatters.scss
+++ b/wagtail/wagtailadmin/static/wagtailadmin/scss/components/formatters.scss
@@ -246,6 +246,10 @@ img{
     display:inline-block;
 }
 
+.block{
+    display:block;
+}
+
 .unlist{
     @include unlist();
 }