Nolan Project Page "Feature Project"

Site URL: https://nolan-demo.squarespace.com/our-work

I'm currently using the Nolan template in 7.1.  Is it possible to have a 'feature project' at the top basically a larger version of the project thumbnails that functions in the same way?  So the structure would be 1 column with the feature project spanning the full width, then back to the 2 column structure?

https://nolan-demo.squarespace.com/our-work

Add to Page Settings > Advanced > Header

.grid-item:first-child {
    grid-column: 1 / -1;
}

Doesn't appear to do anything other than what you see attached

sorry, missing style tag

<style>
  .grid-item:first-child {
    grid-column: 1 / -1;
}
</style>

Perfect, works a treat, thank you