<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
*{
margin: 0;
padding: 0;
}
.box{
display:flex;
flex-direction:column;
height: 100%;
}
.div1{
background-color: red;
}
.div2{
background-color: green;
flex:1;
}
</style>
</head>
<body>
<div class="box">
<div class="div1">111 </div>
<div>3333</div>
<div class="div2">222</div>
</div>
<script>
</script>
</body>
</html>
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