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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
<title> 页面名称 </title>
<style type="text/css">
.d_parent {
width: 1200px;
height: 300px;
background-color: skyblue;
display: flex;
justify-content: center;
align-items: center;
}
.d_children {
width: 300px;
height: 180px;
background-color: green;
}
</style>
</head>
<body>
<div class="d_parent">
<div class="d_children">111</div>
<div class="d_children">222</div>
<div class="d_children">333</div>
<div class="d_children">444</div>
</div>
</body>
</html>