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图片自适应容器大小

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>img auto</title>
    <style>
        body {
            position: relative;
        }
        .parent {
            position: absolute;
            width: 100%;
            height: 100%;
            top:0;
            left: 0;
            right: 0;
            bottom: 0;
        }
        .item {
            float: left;
            width: 20%;
            margin: 10px 2.5%;
            height: 0;
            padding-bottom: 12.5%;
            background-color: #dbe0e4;
            background: url(gril.jpg) no-repeat;
            background-size: cover;
        }
    </style>
</head>
<body>
    <div class="parent">
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
    </div>
</body>
</html>

利用padding撑开盒子大小，padding-bottom撑开子元素的高度，子元素宽度与高度成比例，这样就可以自适应了

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原文地址：https://www.cnblogs.com/harlem/p/10074087.html