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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>JS Bin</title>
<style>
* {
margin: 0;
padding: 0;
}
.parent {
width: 200px;
height: 150px;
background-color: black;
display: flex;
flex-flow: row wrap;
align-content: flex-start;
}
.child {
box-sizing: border-box;
background-color: white;
flex: 0 0 25%;
height: 50px;
border: 1px dotted grey;
list-style: none;
}
</style>
</head>
<body>
<ul class="parent">
<li class="child"></li>
<li class="child"></li>
<li class="child"></li>
<li class="child"></li>
<li class="child"></li>
<li class="child"></li>
<li class="child"></li>
<li class="child"></li>
<li class="child"></li>
<li class="child"></li>
<li class="child"></li>
<li class="child"></li>
</ul>
</body>
</html>