Any page in NationBuilder can be easily turned into a splash (landing) page.
Set up a splash page
You can set a splash page by going to Website > Pages > Select Page > Page settings.
Then, check the box next to "Make this the splash page" and click Save page . Things like the top banner, navigation, sidebars, and footer are taken out, and instead only the content of the page displays with a big "Continue to [page name] page" button added to the bottom.
Splash pages will show to a visitor only once. The most popular page-types used are the signup and volunteer pages. Your homepage cannot be set as the splash page and a page must be published in order to see the option to make it a splash page.
If you've created a custom design you will want to edit the splash.html file, located under Websites > Theme > Current Custom Theme > Templates > splash.html.
To see what the page will look like in testing, you can manually trigger splash page mode by adding "?splash=1" to the end of any NationBuilder URL.