I need a banner advert for my website to promote my eBook

Hi there,

I run a careers advice website and I'm looking to promote my new eBook using a banner ad displayed in my pages.

Here are some links for context:
Website - https://www.conservation-careers.com
Landing page for people who click the banner - https://mailchi.mp/conservation-careers.com/job-application-guide.
Ebook file - https://www.dropbox.com/s/unjgyrl568caa64/How-to-Apply-for-a-Conservation-Job_Guide-by-Conservation-Careers_full.pdf?dl=1

The banner ad will be inserted into my posts and pages, and the goal is to entice people to download my free guide for how to apply for a conservation job.

It needs to be on brand, simple, clean and engaging. I'd be open to it being animated just a little if it helps conversions.

Happy to answer questions.

Nick