'Set a background if item has an item with specific class with css

I want to set a background to parent element if it has an item with 'open' class item with css. Main goal is add a background color the parent element.

For example:

<div class='parent'>
    <span class='title'>title</span>
    <span class='arrow open'>I should have a blue background!</span>
</div>
css


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