Update file homepage.js

static/homepage.js

@@ -185,7 +185,7 @@ function draw(){
     let scrTop = document.documentElement.scrollTop;
     var canvas = document.getElementById("tutorial")
     canvas.width = 1300;
-    canvas.height = 2000;
+    canvas.height = 4500;
     let cvs_h = canvas.getBoundingClientRect().top + scrTop;
     let cur_h = document.documentElement.clientHeight / 1.8 + scrTop;
     top_screen = Math.floor(-canvas.getBoundingClientRect().top);
@@ -249,7 +249,7 @@ function draw(){
 
     
     var centerX = canvas.width / 2;  
-    verticalLine(centerX, 200, 2000, ctx, canvas_h);
+    verticalLine(centerX, 200, 4500, ctx, canvas_h);
 
     circularArc(centerX - 30, 1600, ctx, canvas_h, 3, 0);