Make a transparent navigation menu to my header picture

Hey guys,

I would like to have my navigation head transparent so the menu is going to be a part of my header image, like this: http://propel-template.webflow.io/

I am super new to Webflow, but hopefully, someone can help me out.

Here is my site: https://preview.webflow.com/preview/accretio-tech-2?utm_medium=preview_link&utm_source=designer&utm_content=accretio-tech-2&preview=b74144b1b3c3791b7bc95f96ec2b2d6d&mode=preview