diff --git a/packages/layers/src/line/shaders/line_arc_frag.glsl b/packages/layers/src/line/shaders/line_arc_frag.glsl
index 4c1757aaf6..7c9802c707 100644
--- a/packages/layers/src/line/shaders/line_arc_frag.glsl
+++ b/packages/layers/src/line/shaders/line_arc_frag.glsl
@@ -21,7 +21,6 @@ void main() {
   gl_FragColor.a *= (blur * u_opacity);
   if(u_line_type == LineTypeDash) {
     gl_FragColor.a *= blur  * (1.0- step(v_dash_array.x, mod(v_distance_ratio, v_dash_array.x +v_dash_array.y)));
-    // gl_FragColor.a =
   }
 
   if(u_aimate.x == Animate) {
@@ -29,7 +28,6 @@ void main() {
       alpha = (alpha + u_aimate.w -1.0) / u_aimate.w;
       alpha = smoothstep(0., 1., alpha);
       gl_FragColor.a *= alpha;
-      // gl_FragColor.a = fract(u_time);
   }
   gl_FragColor = filterColor(gl_FragColor);
 }
diff --git a/packages/layers/src/line/shaders/line_frag.glsl b/packages/layers/src/line/shaders/line_frag.glsl
index a9374b50c4..5cc5b3ce92 100644
--- a/packages/layers/src/line/shaders/line_frag.glsl
+++ b/packages/layers/src/line/shaders/line_frag.glsl
@@ -30,10 +30,7 @@ void main() {
   if(u_aimate.x == Animate) {
       float alpha =1.0 - fract( mod(1.0- v_distance_ratio, u_aimate.z)* (1.0/ u_aimate.z) + u_time / u_aimate.y);
       alpha = (alpha + u_aimate.w -1.0) / u_aimate.w;
-      alpha = smoothstep(0., 1., alpha);
-      float alpha2 = exp(-abs(v_side));
       gl_FragColor.a *= alpha * blur;
-      // gl_FragColor.a = fract(u_time);
   }
  // dash line
   if(u_line_type == LineTypeDash) {
diff --git a/stories/Layers/components/Arc2DLine.tsx b/stories/Layers/components/Arc2DLine.tsx
index 8253bf9228..a0aa57aa44 100644
--- a/stories/Layers/components/Arc2DLine.tsx
+++ b/stories/Layers/components/Arc2DLine.tsx
@@ -33,7 +33,7 @@ export default class Arc2DLineDemo extends React.Component {
           y1: 'lat2',
         },
       })
-      .size(1.2)
+      .size(4)
       .shape('greatcircle')
       .color('rgb(13,64,140)')
       .animate({