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HTML

            
              
            
          
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↑ Insert the most common viewport meta tag

CSS

            
              html, body {
  height: 100%;
  background: #ccc;
  padding: 20px;
}
body {
  padding: 20px;
  background: white url(http://s.cdpn.io/3/robot-dog.png) calc(100% - 25px) calc(100% - 25px) no-repeat;
  
}
* {
  box-sizing: border-box;
}
            
          
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JS

            
              
            
          
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