css布局（flex）
先来张效果图
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>display-flex</title>
<style>
*{
margin: 0;
padding: 0;
}
.flex-container{
max-width: 960px;
margin: 100px auto;
display:flex;
flex-wrap: wrap;
}
.one{ background: pink; }
.two{ background: lightgreen; }
.three{ background: skyblue; }
.box{
height: 100px;
min-width: 300px;
flex-grow: 1;
}
</style>
</head>
<body>
<div class="flex-container">
<div class="box one"></div>
<div class="box two"></div>
<div class="box three"></div>
</div>
</body>
</html>