diff --git a/observe_main.html b/observe_main.html
index ecba785..645ee2b 100644
--- a/observe_main.html
+++ b/observe_main.html
@@ -591,7 +591,7 @@
       // draw on canvas.
       if (e.buttons == 1){
         ctx.beginPath(); // begin
-        ctx.lineWidth = 0.5;
+        ctx.lineWidth = 5;
         ctx.lineCap = 'round';
         ctx.strokeStyle = 'black';
         // update line
@@ -611,7 +611,7 @@
     function draw_path(path){
       // draw a path on the canvas.
       ctx.beginPath(); // begin
-      ctx.lineWidth = 0.5;
+      ctx.lineWidth = 2;
       ctx.lineCap = 'round';
       ctx.strokeStyle = 'black';
       for (var i = 0; i < path.length-1; i++) {