a GIF will explain it better:

I need help getting the note to fill up the empty space that’s left over when it goes into full screen. Is there any way to do that?
I can’t figure out which elements I should apply the CSS to in order to get it right. For the page layout I’m using:
.page-style-read-mode .markdown-preview-view:not(.markdown-embed .markdown-preview-view) {
padding-top: 5px !important;
top: 85px !important;
margin: 0px 15px 0px 15px !important;
border-top-left-radius: var(--radius-s);
border-top-right-radius: var(--radius-s);
padding-left: var(--padding-note-content);
padding-right: var(--padding-note-content);
border: 0.5px solid var(--background-modifier-border);
box-shadow: var(--mac-terminal-shadow);
}