diff --git a/app/assets/stylesheets/events.css b/app/assets/stylesheets/events.css
index 7e68e6976..7dc689067 100644
--- a/app/assets/stylesheets/events.css
+++ b/app/assets/stylesheets/events.css
@@ -18,9 +18,10 @@
   }
 
   .events__activity-summary {
+    border: solid var(--color-ink-lighter);
+    border-width: 1px 1px 0 1px;
     color: var(--color-ink-darker);
     inline-size: auto;
-    margin-block-end: calc(var(--block-space) * -1);
     margin-inline: auto;
     padding: 1.1lh 1lh 1lh;
     position: relative;
diff --git a/app/views/events/day_timeline/_summary.html.erb b/app/views/events/day_timeline/_summary.html.erb
index 157ca5a25..58979c873 100644
--- a/app/views/events/day_timeline/_summary.html.erb
+++ b/app/views/events/day_timeline/_summary.html.erb
@@ -1,4 +1,4 @@
-<div class="events__activity-summary txt-small fill-white border">
+<div class="events__activity-summary txt-small">
   <% if day_timeline.summarized? %>
     <%= render "events/day_timeline/activity_summary", summary: day_timeline.summary %>