diff --git a/src/pages/catchup.css b/src/pages/catchup.css
index 7036c78..ab03f43 100644
--- a/src/pages/catchup.css
+++ b/src/pages/catchup.css
@@ -209,11 +209,15 @@
   margin: 0 16px;
   padding: 1px;
   display: flex;
-  gap: var(--hairline-width);
+  row-gap: var(--hairline-width);
   pointer-events: none;
   justify-content: stretch;
   background-image: linear-gradient(to bottom, transparent, var(--bg-color));
 
+  @media (min-width: 640px) {
+    column-gap: var(--hairline-width);
+  }
+
   .posts-bin {
     display: flex;
     gap: var(--hairline-width);