<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
<style>
.flex-container {
display: flex;
height: 150px;
padding: 10px;
margin-bottom: 20px;
border: 1px dashed #666;
}
.flex-container > div {
width: 15%;
margin: 5px;
border-radius: 3px;
background-color: #8ebf42;
}
.second > div {
flex: 1;
}
</style>
</head>
<body>
<div class="flex-container">
<div></div>
<div></div>
<div></div>
</div>
<div class="flex-container second">
<div></div>
<div></div>
<div></div>
</div>
</body>
</html>