diff --git a/HISTORY.md b/HISTORY.md
index aedcabb..b038d2c 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -5,6 +5,8 @@ https://github.com/josdejong/jsoneditor
 
 ## not yet released, version 5.28.1
 
+- Fix #637: vertical white border left/right from the main menu in some
+  specific circumstances.
 - Fix #638: cannot expand after collapse. Regression introduced in v5.28.0.
 
 
diff --git a/src/css/jsoneditor.css b/src/css/jsoneditor.css
index 1b6268a..f1af3af 100644
--- a/src/css/jsoneditor.css
+++ b/src/css/jsoneditor.css
@@ -226,7 +226,7 @@ div.jsoneditor-tree div.jsoneditor-date {
 
 div.jsoneditor {
   color: #1A1A1A;
-  border: 1px solid #3883fa;
+  border: thin solid #3883fa; /* we use thin and not 1px to work around an issue in Chrome/IE, see #637 */
   -moz-box-sizing: border-box;
   -webkit-box-sizing: border-box;
   box-sizing: border-box;