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<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1"> <style> .arrow { border: solid black; border-width: 0 3px 3px 0; display: inline-block; padding: 3px; } .right { transform: rotate(-45deg); -webkit-transform: rotate(-45deg); } .left { transform: rotate(135deg); -webkit-transform: rotate(135deg); } .up { transform: rotate(-135deg); -webkit-transform: rotate(-135deg); } .down { transform: rotate(45deg); -webkit-transform: rotate(45deg); } </style> </head> <body> <h1>CSS 箭头</h1> <p>右箭头: <i class="arrow right"></i></p> <p>左箭头: <i class="arrow left"></i></p> <p>上箭头: <i class="arrow up"></i></p> <p>下箭头: <i class="arrow down"></i></p> </body> </html>