diff --git a/miniapp/pages/index/index.js b/miniapp/pages/index/index.js
index c62cd20..4a6c770 100644
--- a/miniapp/pages/index/index.js
+++ b/miniapp/pages/index/index.js
@@ -690,7 +690,7 @@ function buildSankeySvgText(links, width, height, renderOptions) {
         0.35
       )}" stroke-width="${formatSvgNumber(
         segment.linkHeight
-      )}" stroke-linecap="round" />`
+      )}" stroke-linecap="butt" />`
     );
   });
 
@@ -1391,7 +1391,7 @@ Page({
       layout.linkSegments.forEach((segment) => {
         ctx.setStrokeStyle(toRgbaColor(getNodeColor(segment.sourceIndex, themeColors), 0.35));
         ctx.setLineWidth(segment.linkHeight);
-        ctx.setLineCap('round');
+        ctx.setLineCap('butt');
         ctx.beginPath();
         ctx.moveTo(segment.startX, segment.sy);
         ctx.bezierCurveTo(