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css 透明度

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>透明度</title>
    <style>
        .c1{
            height: 100px;
            width: 100px;
            background-color: brown;
            color: darkorange;
            opacity: 0.5;
        }

        .c2 {
            height: 150px;
            width: 150px;
            background-color: blueviolet;
            color: rgba(0,123, 211, 0.6);
        }

    </style>
</head>
<body>
<div class="c1">Hello World1</div>
<div class="c2">Hello World!</div>
</body>
</html>

opacity

值 0~1

css
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