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<!DOCTYPE html>
<title>flexbox | margins</title>
<style>
div {
background: black;
margin: 1em;
height: 4em;
}
</style>
<div></div>
<!DOCTYPE html>
<title>flexbox | margins</title>
<style>
div {
background: black;
margin: 1em;
height: 4em;
}
</style>
<div></div>