The flexible box represents the flexible layout which contain multiple boxes.
Example of Code
<style type="text/css">
.outer-container {
font: 16px sans-serif;
background: gold;
color: white;
height: 200px;
display: flex;
}
.box {
padding: 10px;
flex: 1 0 auto;
}
.larger {
background: yellowgreen;
flex: 3 0 auto;
}
</style>
<body>
<div class="outer-container">
<div class="box">Box</div>
<div class="box larger">Larger Box</div>
<div class="box">Box</div>
<div class="box larger">Larger Box</div>
</div>
</body>
Output
BoxLarger BoxBoxLarger Box