摘要：
<!doctype html><html lang="en"><head> <meta charset="UTF-8"> <title>Document</title> <style> * {margin:0; padding: 0} button { width: 50px; } p { text 阅读全文
摘要：
<!doctype html><html lang="en"><head> <meta charset="UTF-8"> <title>tab</title> <style type="text/css"> * {padding:0; margin:0;} button { background-c 阅读全文