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      1 <!doctype html>
      2 <html>
      3 <head>
      4 <style>
      5 body {
      6       background-image:
      7       linear-gradient(45deg, #000000 25%, transparent 25%),
      8       linear-gradient(-45deg, #000000 25%, transparent 25%),
      9       linear-gradient(45deg, transparent 75%, #000000 75%),
     10       linear-gradient(-45deg, transparent 75%, #000000 75%);
     11 
     12       background-size:80px 80px;
     13       background-position: 0 0, 0 80px, 80px -80px, -80px 0px;
     14 }
     15 </style>
     16 </head>
     17 <body>
     18 </body>
     19 </html>
     20