How to make a border-top full-width (only for one page)?

Hey Jak73,
Try this CSS in your Enfold Theme Options ▸ General Styling ▸ Quick CSS field:

#top.page-id-8462 #header .inner-container {
    border-bottom: none;
}
#top.page-id-8462 .av_minimal_header #header_main {
	border-bottom: 1px solid #000;
}

Please ensure to copy the code from the forum and not an email notification so the symbols are not converted.
After applying the css, please clear your browser cache and check.

Best regards,
Mike

Hi,
Glad we were able to help, if you have any further questions please create a new thread and we will gladly try to help you. Thank you for using Enfold.

Best regards,
Mike