changing the background color of the header on single page without taking effect

Hi,
How is it possible to change the background color of the header on a single page without taking effect on other pages and templates?
I’d also like to ask if I use pro demo and pro templates, but on the contact page I am using Nature Love template which is not a pro template would it be a performance disadvantage on the entire site?
Thank you very much,

Thanks for your advise I recreated the contact page with disabled standard pack, but I can’t change the background color of the header only on this contact page without taking effect on the whole site, I am using the tagDiv Composer. I use the Header Template 5 from the cloud library.
Thank you,

Hello,
I tried this on multiple time, but it dose not work. I am using a demo (Life News) with Header Template 5 from the cloud library may be that’s why I can’t change the color in this way.
Thank you,

It is still a test-site
https://atn2.000webhostapp.com
Thank you,

Hello,
I know this, I have done this color setting and before it I had added the same header template with website manager as you suggested, but it affect the color of the header for all of the website pages. I’d like to use the header background color of #151515 for all pages except the contact page where I’d like to use #040406 color.
Thank you,

It’s working. Thank You,