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<!DOCTYPE html>
<html>
<style>
:root {
--child-width: 0px;
}
.scrollable {
overflow: scroll;
height: 100px;
width: 100px;
border: 2px solid black;
}
.scrollable::before {
display: block;
content: "content";
height: 300px;
width: var(--child-width);
}
</style>
<div class="scrollable"></div>
<div class="scrollable"></div>
<div class="scrollable"></div>
</html>