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图片在正方形容器内缩放至适合尺寸并水平居中和垂直居中

<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <title>图片在正方形容器内缩放至适合尺寸并水平居中和垂直居中</title>
    <style type="text/css">
        * {
            margin: 0;
            padding: 0;
            line-height: 1;
        }
        .square-container {
            float: left;
            overflow: hidden;
            margin: 100px 0 0 100px;
            width: 250px;
            height: 250px;
            background-color: #c8c8c8;
            background-position: 50%;
            background-size: contain;
            background-repeat: no-repeat;
        }
    </style>
</head>
<body>
<div class="square-container" style="background-image:url(1.jpg);"></div>
<div class="square-container" style="background-image:url(2.jpg);"></div>
<div class="square-container" style="background-image:url(3.jpg);"></div>
</body>
</html>