xxxxxxxxxx
<style>
.children{
overflow:hidden;
}
#child-2{
overflow:unset;
}
</style>
<div id="parent">
<div id="child-1" class="children"><p>Foo</p></div>
<div id="child-2" class="children"><p>Bar</p></div>
<div id="child-3" class="children"><p>Baz</p></div>
</div>