Merge pull request #5153 from nick-lawrence-ctm/main

When horizontal, remove the border from all control buttons

.changeset/serious-jeans-tap.md

@@ -0,0 +1,5 @@
+---
+'@xyflow/system': patch
+---
+
+Add separators to horizontal control buttons

packages/system/src/styles/style.css

@@ -158,4 +158,17 @@
   &-button:last-child {
     border-bottom: none;
   }
+
+  &.horizontal &-button {
+    border-bottom: none;
+    border-right: 1px solid
+      var(
+        --xy-controls-button-border-color-props,
+        var(--xy-controls-button-border-color, var(--xy-controls-button-border-color-default))
+      );
+  }
+
+  &.horizontal &-button:last-child {
+    border-right: none;
+  }
 }