diff --git a/src/glsl/webgl2/line/base.frag b/src/glsl/webgl2/line/base.frag
index fe155487..878e8a78 100644
--- a/src/glsl/webgl2/line/base.frag
+++ b/src/glsl/webgl2/line/base.frag
@@ -17,7 +17,9 @@ void main() {
         color = u_color;
 
         // distance from line to compute the anti-aliasing
-        float dist = abs(u_thickness * l.y);
-        color.a = color.a * (1.0 - smoothstep(u_thickness*0.5 - 1.0, u_thickness*0.5, dist));
+        float dist = abs((u_thickness + 2.0) * l.y);
+
+        float half_thickness = (u_thickness + 2.0) * 0.5;
+        color.a = color.a * (1.0 - smoothstep(half_thickness - 1.0, half_thickness, dist));
     }
 }
\ No newline at end of file
diff --git a/src/glsl/webgl2/line/inst_lonlat.vert b/src/glsl/webgl2/line/inst_lonlat.vert
index b47e02c3..42e8889e 100644
--- a/src/glsl/webgl2/line/inst_lonlat.vert
+++ b/src/glsl/webgl2/line/inst_lonlat.vert
@@ -38,7 +38,7 @@ void main() {
     float ndc2pix = 2.0 / u_width;
 
     vec2 p_ndc_x = x_b * vertex.x;
-    vec2 p_ndc_y = u_thickness * y_b * vertex.y * vec2(1.0, u_width/u_height) * ndc2pix;
+    vec2 p_ndc_y = (u_thickness + 2.0) * y_b * vertex.y * vec2(1.0, u_width/u_height) * ndc2pix;
 
     vec2 p_ndc = p_a_ndc + p_ndc_x + p_ndc_y;
     gl_Position = vec4(p_ndc, 0.f, 1.f);
diff --git a/src/glsl/webgl2/line/inst_ndc.vert b/src/glsl/webgl2/line/inst_ndc.vert
index 07adc16d..00d72736 100644
--- a/src/glsl/webgl2/line/inst_ndc.vert
+++ b/src/glsl/webgl2/line/inst_ndc.vert
@@ -16,7 +16,7 @@ void main() {
 
     float ndc2pix = 2.0 / u_width;
 
-    vec2 p = p_a + x_b * vertex.x + u_thickness * y_b * vertex.y * vec2(1.0, u_width/u_height) * ndc2pix;
+    vec2 p = p_a + x_b * vertex.x + (u_thickness + 2.0) * y_b * vertex.y * vec2(1.0, u_width/u_height) * ndc2pix;
     gl_Position = vec4(p, 0.f, 1.f);
     l = vec2(0.0, vertex.y);
 }
\ No newline at end of file
diff --git a/src/js/Aladin.js b/src/js/Aladin.js
index 69e3a8d2..cf5cfd1c 100644
--- a/src/js/Aladin.js
+++ b/src/js/Aladin.js
@@ -732,7 +732,7 @@ export let Aladin = (function () {
         reticleColor: "rgb(178, 50, 178)",
         reticleSize: 22,
         gridColor: "rgb(178, 50, 178)",
-        gridOpacity: 0.4,
+        gridOpacity: 0.8,
         gridOptions: {
             enabled: false,
             showLabels: true,