Hide Member Login on most pages

My client wants to only show the 'Login' button on certain pages. Is there a simple way to hide it in the header on select pages (most pages on the site - it only actually appears on ~5 pages out of hundreds).

You can try CSS. If you share link to your site, we can check easier.

On 7.1, I use this CSS Code to hide the built-in login button that appears in the header:

.user-account-link {
   display: none !important;
}

This hides it from all pages, so if you want it on some pages, you could create a link to the account login page on those pages.