Flex左右布局，高度相等自适应

css:

//body高度要撑开
html,body{
	min-height: 100%;
	height: 100vh;
}
//父级
.box-fix{
    min-height: 100%;
    display: flex;
	justify-content: space-between;
}
子级
.main-left{
	width: 210px;
	flex: 0 0 210px;
	height: auto;
}
.main-right{
	flex: 1;
}