'How to change the css in iframe which is inside the shadow root

Is there a way to change styles found in a iframe, which the iframe is in a shadow root? I try a lot,However it just works on the element in shadow root but not in the inner iframe.

<div class="outer">
  #shadow root(open)
    <iframe>
       <div class="inner"></div>
    </iframe>
</div>
cssiframe


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