1 <style> 2 div { 3 width: 0; 4 height: 0; 5 border-top: 40px solid transparent; 6 border-left: 40px solid transparent; 7 border-right: 40px solid transparent; 8 border-bottom: 40px solid pink; 9 } 10 </style> 11 </head> 12 <body> 13 <div></div> 14 </body>