Custom Page Is Too Narrow on Desktop — How to Make It Full Width?

Hi everyone,

I’m trying to make my custom page (/pages/nuestra-esencia) full width on desktop, but it’s stuck at a narrow layout, even after trying to override with custom CSS. I’ve edited theme.liquid and base.css, and tried applying styles like:
.t4s-content-position.t4s-container,
.page-width-wide {
max-width: 100% !important;
width: 100% !important;
}
Still no change. Inspect doesn’t open on my browser either.

What’s the best way to force full-width for specific page or all pages? I am using 2 themes currently: atelier and vessel and with both i am facing the same problem.