<script> 
 var c = document.getElementById("c"); 
 var ctx = c.getContext("2d"); 
  
 //making the canvas full screen 
 c.height = window.innerHeight; 
 c.width = window.innerWidth; 
  
 //chinese characters - taken from the unicode charset 
 var chinese = "田由甲申甴电甶男甸甹町画甼甽甾甿畀畁畂畃畄畅畆畇畈畉畊畋界畍畎畏畐畑"; 
 //converting the string into an array of single characters 
 chinese = chinese.split("");
  
 var font_size = 18; 
 var columns = c.width/font_size; //number of columns for the rain 
 //an array of drops - one per column 
 var drops = []; 
 //x below is the x coordinate 
 //1 = y co-ordinate of the drop(same for every drop initially) 
 for(var x = 0; x < columns; x++) 
  drops[x] = 1;  
  
 //drawing the characters 
 function draw() 
 { 
  //Black BG for the canvas 
  //translucent BG to show trail 
  ctx.fillStyle = "rgba(0, 0, 0, 0.05)"; 
  ctx.fillRect(0, 0, c.width, c.height); 
   
  ctx.fillStyle = "#0F0"; //green text 
  ctx.font = font_size + "px arial"; 
  //looping over drops 
  for(var i = 0; i < drops.length; i++) 
  { 
    //a random chinese character to print 
    var text = chinese[Math.floor(Math.random()*chinese.length)]; 
    //x = i*font_size, y = value of drops[i]*font_size 
    ctx.fillText(text, i*font_size, drops[i]*font_size); 
     
    //sending the drop back to the top randomly after it has crossed the screen 
    //adding a randomness to the reset to make the drops scattered on the Y axis 
    if(drops[i]*font_size > c.height && Math.random() > 0.975) 
      drops[i] = 0; 
     
    //incrementing Y coordinate 
    drops[i]++; 
  } 
 } 
  
 setInterval(draw, 33); 
 </script>