| <!DOCTYPE html> | 
 | <html> | 
 | <head> | 
 | <style> | 
 | #background { | 
 |  background-color: yellow; | 
 |  display: inline-block; | 
 | } | 
 |  | 
 | .container { | 
 |  font-size: 0px; | 
 | } | 
 | </style> | 
 | </head> | 
 | <body> | 
 |  | 
 | <div id="background"> | 
 |  <div class="container"> | 
 |  <canvas id ="box-1" width="200" height="200"></canvas> | 
 |  </div> | 
 |  <div class="container"> | 
 |  <canvas id ="box-2" width="200" height="200"></canvas> | 
 |  </div> | 
 | </div> | 
 |  | 
 | <script> | 
 | function drawCanvas(canvasID, color, width) { | 
 |  var canvas = document.getElementById(canvasID); | 
 |  var context = canvas.getContext("2d", {alpha: true}); | 
 |  context.clearRect(0, 0, canvas.width, canvas.height); | 
 |  context.strokeStyle = color; | 
 |  context.lineWidth = width; | 
 |  context.strokeRect(40, 40, 120, 120); | 
 | }; | 
 |  | 
 | drawCanvas('box-1', 'rgb(50, 100, 150)', '5px'); | 
 | drawCanvas('box-2', 'rgb(150, 100, 50)', '10px'); | 
 |  | 
 | </script> | 
 | </body> | 
 | </html> |