How do I make ad unit height lower?

Hello

I have been trying for so long to make my mobile ads height lower because i want a mobile banner ad but it doesnt matter what I edit in the code, the ads height will always be 312px height. This is the ad code I use:

<div>
<script async src='https://ift.tt/2PMCUg5>
<ins class='adsbygoogle'
style='display:block; height: 180px'
data-ad-client='ca-pub-123
data-ad-slot='123'
data-ad-format='auto'
overlays='false'...

How do I make ad unit height lower?

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