Keep the gap blank, and give the writing more of the page

Two things wrong with the paper.

"Start writing..." was printed at the foot of every page that had a break
after it. The placeholder extension styles `[contenteditable]:empty::before`,
and the spacer holding a gap open is exactly that: empty, and not
editable. It inherited a placeholder meant for an empty note.

And the column was too narrow for the sheet it now sits on — about 73
characters, which left 117px of blank paper down each edge and made the
writing look lost. Widened to about 80, a little short of where the eye
stops reliably finding the start of the next line, which leaves roughly
8% of the sheet as margin: a document's margin rather than a picture
frame.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

readme.md

@@ -373,9 +373,12 @@ state of their own, so they can be read on their own.
 
 ## Setting a note
 
-**A centred column, about 73 characters to the line** — measured, not guessed.
+**A centred column, about 80 characters to the line** — measured, not guessed.
 Past roughly 84 the eye stops reliably finding the start of the next line, so the
-column is capped well before the pane runs out.
+column is capped a little short of that. It leaves roughly 8% of the sheet as
+margin down either side: a document's margin, not a picture frame. At 73
+characters it left 117px of empty paper down each edge and the writing looked
+lost on the page.
 
 It was pinned to the left margin for a while, on the reasoning that a column
 which floats in the middle moves as the window is resized. True, but it traded