2.3 CSS——内外边距、盒子模型、位置、浮动学习笔记

作者： 作者的头像   diaochangxiao ,  2025-03-27 18:09:16 · 山东 ,  所有人可见 ,  阅读 3

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笔记1

index.html

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

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="static/css/style.css" type="text/css">
</head>

<body style="margin: 0;">
    <div class="div-outer">
        <div class="div-inner"></div>
        <div class="div-inner-1"></div>
    </div>
    <br>
    <div class="div-outer1">
        <div class="div-inner2">
            123
        </div>
    </div>
    <br>
    <div class="div-outer2">
        <div class="div-inner3">
            1
        </div>
        <div class="div-inner4">
            2
        </div>
        <div class="div-inner5">
            3
        </div>
    </div>
</body>

</html>

style.css

/*1*/
.div-outer {
    width: 300px;
    height: 400px;
    background-color: lightblue;
    /*不让子元素带父元素，让top边距不起作用*/
    /* border-top: 1px solid; */
    /* padding-top: 1px; */
    /* overflow: hidden; */
}

/*不让子元素带父元素，让top边距不起作用*/
.div-outer::before {
    content: "";
    display: table;
}

.div-inner {
    width: 100px;
    height: 100px;
    background-color: darkred;
    /*上下是最大的生效*/
    /*左右是相加*/
    margin-bottom: 20px;
    margin-left: 20px;
    /*水平居中实现，上下实现不了*/
    /* margin: 10px auto; */
}

.div-inner-1 {
    width: 100px;
    height: 100px;
    background-color: darkgreen;
    /*最大的生效*/
    margin-top: 30px;
    margin-left: 30px;
}

/*2*/
.div-outer1 {
    width: 300px;
    height: 400px;
    background-color: lightblue;
    padding: 20px 0 0 30px;
}

.div-inner2 {
    width: 100px;
    height: 100px;
    background-color: darkred;
    color: white;
    /*content-box增加内边距和边框都会让div变大*/
    box-sizing: border-box;
    padding: 20px 0 0 10%;
    border: 10px solid black;
}

/*3*/
.div-outer2 {
    width: 300px;
    height: 400px;
    background-color: lightblue;
    margin: 100px;
}

.div-inner3 {
    width: 100px;
    height: 100px;
    background-color: darkred;
    color: white;
    margin: 10px;
    display: inline-block;
    position: relative;
    z-index: 2;
}

.div-inner4 {
    width: 100px;
    height: 100px;
    background-color: darkgreen;
    color: white;
    margin: 10px;
    display: inline-block;
    position: relative;
    top: 30px;
    left: -100px;
}

.div-inner5 {
    width: 100px;
    height: 100px;
    background-color: darkred;
    color: white;
    margin: 10px;
    display: inline-block;
}

笔记2（绝对定位、固定定位）

index.html

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

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="static/css/style.css" type="text/css">
</head>

<body style="margin: 0;">
    <div class="div-outer">
        <div class="div-inner-1">
            1
        </div>
        <div class="div-inner-2">
            2
        </div>
        <div class="div-inner-3">
            3
        </div>
        <div class="div-inner-4">
            回到顶部
        </div>
    </div>
</body>

</html>

style.css

.div-outer {
    width: 300px;
    height: 3000px;
    background-color: lightblue;
    margin: 100px;
}

.div-outer::before {
    content: "";
    display: table;
}

.div-inner-1 {
    width: 100px;
    height: 100px;
    background-color: darkred;
    color: white;
    margin: 10px;
    display: inline-block;
}

.div-inner-2 {
    width: 100px;
    height: 100px;
    background-color: darkgreen;
    color: white;
    display: inline-block;
    /*脱离文档流*/
    position: absolute;
    top: 100px;
    left: 20px;
}

.div-inner-3 {
    width: 100px;
    height: 100px;
    background-color: darkred;
    color: white;
    margin: 10px;
    display: inline-block;
}

.div-inner-4 {
    width: 30px;
    height: 100px;
    background-color: darkgreen;
    color: white;
    display: inline-block;
    position: fixed;
    top: 200px;
    right: 0;
}

笔记3（粘性定位）

index.html

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

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="static/css/style.css" type="text/css">
</head>

<body style="margin: 0;">
    <div class="div-outer">
        <div class="div-inner-2">
            2
        </div>
        <div class="div-inner-1">
            1
        </div>
        <div class="div-inner-2">
            2
        </div>
        <div class="div-inner-3">
            3
        </div>
        <div class="div-inner-2">
            2
        </div>
    </div>
</body>

</html>

style.css

.div-outer {
    width: 300px;
    height: 3000px;
    background-color: lightblue;
    margin: 100px;
}

.div-outer::before {
    content: "";
    display: table;
}

.div-inner-1 {
    width: 100px;
    height: 100px;
    background-color: darkred;
    color: white;
    margin: 10px;
    position: sticky;
    top: 0;
}

.div-inner-2 {
    width: 100px;
    height: 1000px;
    background-color: darkgreen;
    color: white;
    margin: 10px;
}

.div-inner-3 {
    width: 100px;
    height: 100px;
    background-color: darkred;
    color: white;
    margin: 10px;
    position: sticky;
    bottom: 10px;
}

笔记4（浮动）

index.html

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

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="static/css/style.css" type="text/css">
</head>

<body style="margin: 0;">
    <div class="div-outer">
        <div class="div-inner-2">
            2
        </div>
        <div class="div-inner-1">
            1
        </div>
        <div class="div-inner-2">
            2
        </div>
        <div class="div-inner-3">
            3
        </div>
        <div class="div-inner-2">
            2
        </div>
        <div class="div-inner-3">
            3
        </div>
        <div class="div-inner-3">
            3
        </div>
        <div class="div-inner-3">
            3
        </div>
        <div class="div-inner-3">
            3
        </div>
        <div class="div-inner-3">
            3
        </div>
        <div class="div-inner-3">
            3
        </div>
        <div class="div-inner-3">
            3
        </div>
        <div class="div-inner-4">

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

</html>

style.css

.div-outer {
    width: 100%;
    height: 3000px;
    background-color: lightblue;
}

.div-outer::before {
    content: "";
    display: table;
}

.div-inner-1 {
    width: 100px;
    height: 100px;
    background-color: darkred;
    color: white;
    position: sticky;
    top: 0;
    /*inline-block左右有缝隙，浮动无缝隙*/
    float: left;
}

.div-inner-2 {
    width: 100px;
    height: 100px;
    background-color: darkgreen;
    color: white;
    float: left;
}

.div-inner-3 {
    width: 100px;
    height: 100px;
    background-color: darkred;
    color: white;
    position: sticky;
    bottom: 10px;
    float: left;
}

.div-inner-4 {
    width: 300px;
    height: 300px;
    background-color: darkgoldenrod;
    position: relative;
    z-index: 3;
    /*清除左浮动*/
    clear: left;
}

stack overflow小名片

index.html

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

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="static/css/style.css" type="text/css">
</head>

<body>
    <div class="user-card">
        <div class="user-card-head">
            asked Feb 9, 2019 at 18:18
        </div>
        <div class="user-card-body">
            <div class="user-card-body-photo">
                <a href="https://www.acwing.com/user/myspace/index/458546/" target="_blank"><img
                        src="static/images/re.jpg"></a>
            </div>
            <div class="user-card-body-info">
                <div class="user-card-body-info-username">
                    <a href="https://www.acwing.com/user/myspace/index/458546/" target="_blank">diaochangxiao</a>
                </div>
                <div class="user-card-body-info-reputation">
                    <span style="color:#6A737C; font-weight:bold">1,024</span>
                    <div class="user-card-body-info-reputation-item" style="background-color:#EECC01;"></div>
                    3
                    <div class="user-card-body-info-reputation-item" style="background-color:#B4B8BC;"></div>
                    14
                    <div class="user-card-body-info-reputation-item" style="background-color:#D1A684;"></div>
                    25
                </div>
            </div>
        </div>
    </div>
</body>

</html>

style.css

.user-card {
    width: 200px;
    height: 67.69px;
    background-color: #D9EAF7;
    margin: 100px auto;
    padding: 5px 6px 7px 7px;
    box-sizing: border-box;
}

.user-card-head {
    font-size: 12px;
    color: #6A737C;
    margin: 1px 0 4px 0;
}

.user-card-body-photo img {
    width: 32px;
    height: 32px;
    border-radius: 3px;
}

.user-card-body-photo {
    float: left;
}

.user-card-body-info {
    float: left;
    margin-left: 8px;
}

.user-card-body-info-username {
    height: 14px;
    line-height: 14px;
    margin-bottom: 4px;
}

.user-card-body-info-username>a {
    font-size: 13px;
    color: #0074CC;
    text-decoration: none;
}

.user-card-body-info-reputation {
    font-size: 12px;
    color: #838C95;
    height: 14px;
    line-height: 14px;
}

.user-card-body-info-reputation-item {
    width: 6px;
    height: 6px;
    display: inline-block;
    border-radius: 50%;
    margin: 0 3px 0 2px;
    position: relative;
    top: -2px;
}

屏幕截图 2025-04-01 213607.jpg

b站小名片

index.html

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

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="static/css/style.css" type="text/css">
</head>

<body>
    <div class="user-card">
        <div class="user-card-head"></div>
        <div class="user-card-body">
            <div class="user-card-body-left">
                <img src="static/images/info.jpg">
            </div>
            <div class="user-card-body-right">
                <div class="user-card-body-right-text">
                    <div class="user-card-body-right-text-username">
                        藜麦小笼包
                        <span>LV5</span>
                    </div>
                    <div class="user-card-body-right-text-reputation">
                        <span class="user-card-body-right-text-reputation-item">
                            <span>58</span>
                            <span>关注</span>
                        </span>
                        <span class="user-card-body-right-text-reputation-item">
                            <span>3</span>
                            <span>粉丝</span>
                        </span>
                        <span class="user-card-body-right-text-reputation-item">
                            <span>15</span>
                            <span>赞</span>
                        </span>
                    </div>
                </div>
                <div class="user-card-body-right-button">
                    <button>+关注</button>
                    <button>发消息</button>
                </div>
            </div>
        </div>
    </div>
    <!--可以多复制几个，横向排列-->
</body>

</html>

style.css

.user-card {
    width: 366px;
    height: 215px;
    box-shadow: 2px 2px 5px lightgray;
    border-radius: 5px;
    display: inline-block;
}

.user-card-head {
    background-image: url('/Web/static/images/mountain.jpg');
    background-size: cover;
    width: 100%;
    height: 85px;
}

.user-card-body {
    width: 100%;
    height: calc(100% - 85px);
    box-sizing: border-box;
    padding-top: 12px;
}

.user-card-body-left {
    width: 70px;
    height: 100%;
    float: left;
    text-align: center;
}

.user-card-body-right {
    width: calc(100% - 70px);
    height: 100%;
    float: left;
}

.user-card-body-left>img {
    width: 48px;
    height: 48px;
    border-radius: 50%;
}

.user-card-body-right-text {
    width: 100%;
    height: 70%;
}

.user-card-body-right-text-username {
    padding-left: 10px;
    font-size: 16px;
    color: #222222;
    font-weight: bold;
}

.user-card-body-right-text-username>span {
    font-size: 12px;
    color: #8BD29B;
    font-style: italic;
}

.user-card-body-right-text-reputation {
    padding-left: 10px;
    padding-top: 12px;
    box-sizing: border-box;
}

.user-card-body-right-text-reputation-item {
    margin-right: 20px;
}

.user-card-body-right-text-reputation-item>span:nth-child(1) {
    font-size: 12px;
    color: #222222;
    font-weight: 500;
}

.user-card-body-right-text-reputation-item>span:nth-child(2) {
    font-size: 12px;
    color: #9499A0;
}

.user-card-body-right-button {
    padding-left: 10px;
}

.user-card-body-right-button>button {
    width: 102px;
    height: 30px;
    border: none;
    border-radius: 5px;
    margin-right: 5px;
    cursor: pointer;
}

.user-card-body-right-button>button:nth-child(1) {
    background-color: #00A1D6;
    color: white;
}

.user-card-body-right-button>button:nth-child(1):hover {
    background-color: #00B5E5;
    transition: 700ms;
}

.user-card-body-right-button>button:nth-child(2) {
    background-color: white;
    border: #CCD0D7 solid 1px;
    color: #6D757A;
}

.user-card-body-right-button>button:nth-child(2):hover {
    border-color: #00B5E5;
    color: #00B5E5;
    transition: 700ms;
}

屏幕截图 2025-04-02 204830.png

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