1 files changed, 3 insertions, 0 deletions
diff --git a/jrrd.js b/jrrd.js
index 48f70c5..46858f0 100644
--- a/jrrd.js
+++ b/jrrd.js
@@ -234,6 +234,9 @@ jrrd.ChartCoordinator = function(ui) {
         return false;
     });
     var rangePreviewOptions = {
+        grid: {
+            borderWidth: 1
+        },
         selection: {
             mode: 'x'
         },