before和after中，是after盖住了before

时间 2020-12-31

原文原文链接

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>百度钱包</title> <style> .miuse { width: 300px; height: 300px; border: 1px solid #000; margin: 100px auto; position: relative; } .miu