<head>
<meta charset="utf-8">
<title>flex</title>
<style>
.main{
display:flex;
border: 3px solid black;
height: 500px;
justify-content:space-between;
align-items:center;
}
.item{
width: 200px;
height: 200px;
background-color: aqua;
margin-right: 10px;
margin-bottom: 10px;
}
</style>
</head>
<body>
<div class="main">
<div class="item">1</div>
<div class="item">2</div>
<div class="item">3</div>
<div class="item">4</div>
<div class="item">5</div>
<div class="item">6</div>
</div>
</body>
代码在此 可以看到设置的item宽高都是200px 但是实时预览的时候在dw里面是这样的
