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<!doctype html>
<style>
div {
width: 100px;
height: 100px;
&.light {
background-image: url("/images/green.png");
}
&.dark {
background-image: url("/images/red.png");
}
}
</style>
<div class="dark"></div>
<div class="light"></div>
<div class="dark"></div>
<div class="light"></div>