diff --git a/webapp/src/styles/_markdown.scss b/webapp/src/styles/_markdown.scss
index 6424b4a29..c0d3a8f42 100644
--- a/webapp/src/styles/_markdown.scss
+++ b/webapp/src/styles/_markdown.scss
@@ -1,6 +1,7 @@
 .markdown__table {
     margin: 5px 0 10px;
     background: var(--center-channel-bg);
+    border-collapse: collapse;
 
     th,
     td {