Why bother with all of that, a simple div in your header includes should be fine:
Code
<div>
<img src="https://www.inliners.org/ubbthreads/images/forumimages/default/Forums_Logo_1355.jpg" style="max-width:100%;" alt="logo">
</div>

Any margin adjustments can be made inline in the div vs affecting the global styling which is used in every faucet of the script

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