diff --git a/web/styles/left_sidebar.css b/web/styles/left_sidebar.css
index 23aea44ae7..83b23bc73e 100644
--- a/web/styles/left_sidebar.css
+++ b/web/styles/left_sidebar.css
@@ -1148,10 +1148,14 @@ li.top_left_scheduled_messages {
 
 .left-sidebar-filter-row {
     display: grid;
+    /* The final 2px column keeps the filter box from going
+       to the edge of the highlighted channel box, and also
+       matches the right edge to the right edge of the vdots
+       on the channel row. (The vdots take a 2px right margin.) */
     grid-template-columns:
         [filter-box-start] minmax(0, 1fr)
         [clear-button-start] var(--line-height-sidebar-row-prominent)
-        [clear-button-end filter-box-end];
+        [clear-button-end filter-box-end] 2px;
     grid-template-rows: [filter-box-start clear-button-start] auto [clear-button-end filter-box-end];
     align-content: center;