diff --git a/frontend/src/components/Flow/flow.css b/frontend/src/components/Flow/flow.css
index faef60b..f313a6b 100644
--- a/frontend/src/components/Flow/flow.css
+++ b/frontend/src/components/Flow/flow.css
@@ -25,6 +25,12 @@
    * back. Per canvas, because the brain draws its connections heavier.
    */
   --edge-pulse-width: 2.5;
+  /*
+   * The line dragged between two ports is the edge it is about to become: the
+   * selected stroke at the same weight, so nothing shifts on release.
+   */
+  --xy-connectionline-stroke: var(--primary);
+  --xy-connectionline-stroke-width: var(--xy-edge-stroke-width);
   --xy-handle-background-color: var(--card);
   --xy-handle-border-color: var(--muted-foreground);
   --xy-selection-background-color: color-mix(