| <style> | |
| .checkboard { | |
| background-image: | |
| linear-gradient(45deg, black 25%, transparent 25%, transparent 75%, black 75%, black), | |
| linear-gradient(45deg, black 25%, transparent 25%, transparent 75%, black 75%, black); | |
| background-position: 0 0, 50px 50px; | |
| background-size: 25% 25%; | |
| outline: 2px solid red; | |
| height: 400px; | |
| width: 400px; | |
| } | |
| </style> | |
| <body> | |
| <div class="checkboard"></div> | |
| </body> |