For the media query width <= 1050), the CSS selector (here) blockquote .sidenote (specifity 0-1-1) is never going to affect the width and margin-right of the sidenotes, because of the selector .sidenote-toggle:checked + .sidenote (here, with specificity 0-3-0), when the input is checked.
But when the input is not checked, the sidenote is not displayed (because media query width <= 1050)), so it doesn't makes much sense.
Also left: 1rem has no effect here, because the position is static.
For the media query
width <= 1050), the CSS selector (here)blockquote .sidenote(specifity 0-1-1) is never going to affect thewidthandmargin-rightof the sidenotes, because of the selector.sidenote-toggle:checked + .sidenote(here, with specificity 0-3-0), when theinputis checked.But when the
inputis not checked, the sidenote is not displayed (because media querywidth <= 1050)), so it doesn't makes much sense.Also
left: 1remhas no effect here, because the position is static.