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<!doctype html>
<!--
Any copyright is dedicated to the Public Domain.
-->
<meta charset="utf-8">
<title>CSS Test Reference</title>
<style>
body {
background: #f3f5f6;
}
div {
font-size: 15px;
--width: 401px;
width: var(--width);
margin: 20px;
background: #fff;
display: flex;
flex-wrap: wrap;
}
b {
height: 50px;
background: red;
width: calc((var(--width) - 4.5em) / 4); /* .5em gutters */
}
b:not(:last-child) {
margin-right: 1.5em;
}
</style>
<div><b></b><b></b><b></b><b></b></div>