<!--basic--flex--layout-->
<html>
<head>
<style>
.parent{
display: flex or inline-flex;
flex-direction: row or column;
flex-wrap: wrap or wrap-reverse;
}
</style>
</head>
<body>
<div class="parent">
<div class="child-1"></div>
.
.
.
</div>
</body>
</html>