then "Edit Header"
Now remove all the css style code from the header and only put back one instead of the 8 you have. Choose carefully.

Leave all of the flex slider code.
You can combine those css styles into one if you find you need parts of a few of them.
It's easy to overlook something you're not looking for.
This is a site I built for my work.(RSD)
http://esmansgreenhouse.com
This is a site I built for use in my job.(HTML Editor)
https://pestlogbook.com
This is my personal site used for testing and as an easy way to share photos.(RLM imported to RSD)
https://ericrohloff.com