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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+ <style>
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+ div {
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+ width: 100px;
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+ height: 100px;
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+ background-color: red;
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+ color: #ff0;
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+ /*
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+ 圆角边框 border-radius
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+ 50% 圆形
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+ 右下border-bottom-right-radius
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+ 右上border-top-right-radius
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+ 左下border-bottom-left-radius
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+ 左上border-top-left-radius
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+ */
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+ /* border-radius: 50%; */
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+ border-bottom-right-radius: 10px;
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+ }
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+ input {
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+ /* 取消边框 */
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+ /* border:none; */
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+ border:1px solid #f00;
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+ /*
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+ outline 轮廓
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+ none 取消轮廓
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+ */
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+ outline: none;
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+ outline: 2px solid #00f;
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+ }
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+ /*
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+ ::before ::after css3的语法
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+ :before :after css2的语法
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+ */
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+ </style>
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+</head>
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+<body>
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+ <div>
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+ <div>你点我啊</div>
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+ <input type="text">
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+ </div>
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+</body>
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+</html>
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