Trying to crerate a landing page

I want to create  landing page that does not show the links to other pages in my website.  I have been advised that I need to inject some text codeas follows:

<style>.Header, .Footer, .Mobile-bar{display:none !important; }</style>

I have done this, but my page still shows links to other pages in my website.

Am I missing something obvious? I am very new to all this.

Many thanks, taunphan.

Your suggestion worked for me.

I am so grateful.