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Css基础——Css的三大特性&圆角边框&阴影

茗越 2024-03-11 阅读 9

CSS的三大特性

1、层叠性

2、继承性

 

3、优先级

复合选择器还有权重叠加的情况

权重会有叠加,但是永远不会进位

圆角边框

1、圆角边框(border-radius)

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div {
            width: 300px;
            height: 150px;
            background-color: aqua;
            border-radius: 10px;
        }
    </style>
</head>

<body>
    <div></div>
</body>

</html>

圆形盒子:

border-radius:正方形盒子边长的一半

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div {
            width: 300px;
            height: 300px;
            background-color: aqua;
            border-radius: 50%;
        }
    </style>
</head>

<body>
    <div></div>
</body>

</html>

圆角矩形:

border-radius:矩形高的一半

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div {
            width: 300px;
            height: 150px;
            background-color: aqua;
            border-radius: 75px;
        }
    </style>
</head>

<body>
    <div></div>
</body>

</html>

阴影

1、盒子阴影(box-shadow)

   

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div {
            width: 300px;
            height: 300px;
            background-color: pink;
            margin: 100px auto;
        }

        div:hover {
            box-shadow: 10px 10px 10px 10px rgba(12, 4, 4, 0.39);
        }
    </style>
</head>

<body>
    <div></div>
</body>

</html>

2、文字阴影(text-shadow)

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        p {
            color: pink;
            font-size: 30px;
            text-shadow: 10px 10px 10px rgba(12, 4, 4, 0.39);
        }
    </style>
</head>

<body>
    <p>迪幻迪幻迪幻迪幻</p>
</body>

</html>
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