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A brief discussion on the use of negative margin in css layout

青灯夜游forward: 2021-02-18 22:48:072159browse

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1. The width of the left and right columns is fixed, and the width of the middle column is adaptive

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>左右栏宽度固定，中间栏宽度自适应</title>
    <style>
        body{
            margin: 0;
            padding: 0;
            min-width:600px;
            color: #fff;
            font-weight: bold;
            font-size: 30px;
            text-align: center;
        }
        .main{
            width: 100%;
            float:left;
        }
        .content{
            margin:0 250px;
            background: #000;
            height: 200px;
        }
        .fl,.fr{
            float: left;
            width:240px;
            height:200px;
        }
        .fl{
            margin-left: -100%;
            background: red;
        }
        .fr{
            margin-left: -240px;
            background: green;
        }
    </style>
</head>
<body>
<div>
    <div>main</div>
</div>
<div>left</div>
<div>right</div>
</body>
</html>

A brief discussion on the use of negative margin in css layout

The effect of reducing the window:

A brief discussion on the use of negative margin in css layout

2. Remove the right border of the list

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>除去列表右边框</title>
    <style>
        *{margin:0;padding: 0;}
        body{background: #000000}
        ul,li{list-style: none;}
        #content{
            width:630px;
            height:400px;
            background: #ccc;
            margin:30px auto;
        }
        #content ul{margin-right:-10px;}
        #content ul li{
            float: left;
            width:150px;
            height:195px;
            margin-right: 10px;
            margin-bottom: 10px;
            background: #e4004e;
            color:#fff;
            font-weight:bold;
        }
    </style>
</head>
<body>
<div id="content">
    <ul>
        <li>除去列表右边框</li>
        <li>除去列表右边框</li>
        <li>除去列表右边框</li>
        <li>除去列表右边框</li>
        <li>除去列表右边框</li>
        <li>除去列表右边框</li>
        <li>除去列表右边框</li>
        <li>除去列表右边框</li>
    </ul>
</div>

</body>
</html>

Effect:

A brief discussion on the use of negative margin in css layout

3. Remove the bottom border (border-bottom) of the last li in the list

Container There is a border, and the list in the container also has a bottom border (border-bottom), causing the border-bottom of the last li to overlap with the outer border of the container. This situation is usually encountered in classified lists;

As shown in the figure:

A brief discussion on the use of negative margin in css layout

Example:

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>除去列表最后一个li的底边框</title>
    <style>
        *{padding: 0;margin:0;}
        ul,li{list-style: none;}
        #category{
            margin:30px auto;
            width:350px;
            background: #eee;
            border: 1px solid #ccc;
            overflow: hidden;/*将超出的部分隐藏,最后一个li的border-bottom超出，被隐藏了;*/
        }
        #category li{
            width:100%;
            height:49px;
            line-height:49px;
            text-indent: 30px;
            border-bottom: 1px dashed #e4007e;
            margin-bottom: -1px;
        }
    </style>
</head>
<body>
<ul id="category">
    <li>女装 /内衣</li>
    <li>男装 /运动户外</li>
    <li>女鞋 /男鞋 /箱包</li>
    <li>化妆品 /个人护理</li>
    <li> 腕表 /珠宝饰品 /眼镜</li>
    <li>零食 /进口食品 /茶酒</li>
    <li>生鲜水果</li>
    <li>大家电 /生活电器</li>
</ul>
</body>
</html>

Effect:

A brief discussion on the use of negative margin in css layout

Note: When the container border color and the container When the colors of the list borders are different, add overflow: hidden on the container element; to hide the overflow part;

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