Embedding a site (from Vev) on my Squarespace site

Site URL: http://www.selmermedia.com

Hi all!

I work for a movie distributor, and I've made a campaign site for an upcoming movie using a CMS called Vev.

https://newslab.vev.site/belle-foreldresak/

The idea was to embed the landing page on the Squarespace home page www.selmermedia.com

However, emedding the site using the embed code provided by Vev doesn't quite work. See: 

https://www.selmermedia.com/test-igjen

I need a way to set the width to 100 per cent, and remove header and footer. 

Are there any ways around this? 

Any help is greatly appreciated! 

Add this to Design > Custom CSS

/* Landing page */
body#collection-62821b857de2c909ba4c9964 {
header#header, footer#footer {
    display: none;
}
main#page {
    margin: 0;
    padding: 0;
    max-width: 100%;
}
.pDJvpY8LjD1 {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
}}