I got the template NEOS, how can I change the header to a sticky header?

I got the template NEOS, how can I change the header to a sticky header? and How can I decrease the margin on two sides or even make it a full-size one?

Thank you

Hey there

thank you for the question

Probably Its possible by custom CSS, but I need to see your website, please include url in the message

Thanks for replying. Now I added some css code and make it look like sticky, but now I have problem making the width of the header the same as the main container, as you can see from the screenshot there are two empty area on two sides, can you please help check how I can adjust the width? The url is listed below.

http://website.nfgovservices.com/

Also I’d like to know if I can make the whole site a full-size one or at least decrease the margin on left and right.
Thanks

hey there

Please add this CSS in appearance - customize - additional CSS

.stickyheader .container {
max-width: 1230px;
}

Thanks!
Colorlib Support Team

Thanks, it works, and I guess my last question is, how I can decrease the space to the left and right of the container, or even make it to a full-size page. Thanks

this is the css code:

.site-wrap {
max-width: 100%;
}

but, which template is this from our templates?