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<!DOCTYPE html>
<!-- This is a reference case for a "4-pages-per-sheet" scenario. The width
and height of each "swatch" is 1/2 the width and height of the page. -->
<style>
html, body { margin: 0; height: 100%; }
body {
display: flex;
flex-flow: row wrap;
}
.swatch {
box-sizing: border-box;
border: 60px solid;
/* The height will be automatically set to the flex container's row height,
via default 'align-self' behavior (which ends up as 'stretch') */
flex: 1 50%;
}
.swatch:nth-child(1) { border-color: cyan; }
.swatch:nth-child(2) { border-color: yellow; }
.swatch:nth-child(3) { border-color: pink; }
.swatch:nth-child(4) { border-color: orange; }
</style>
<div class="swatch"></div>
<div class="swatch"></div>
<div class="swatch"></div>
<div class="swatch"></div>