Confit – change main post/page width?

Hi

Does anyone know how I would adjust the width of the posts/pages (e.g., Hello World) in the right/main column? Basically, I would like it to be wide enough so that it is the same distance from the right edge as it is from the left sidebar.

Example of it here: https://testwpresssite.wordpress.com

I read that if I change

#wrapper {
max-width: 954px;
}

to

#wrapper {
max-width: 100%;
}

then it will adjust…however, when I do that, it does increase the width of the content (to about three-quarters of the right side), but also bumps the content box across to just off the right edge. No matter what % I change it to, it still sticks to that right edge. When I change the right margin, there’s no difference.

If it doesn’t go across the whole width at 100%…what will make it work?

My actual site is password protected, but WordPress.com doesn’t seem to allow me to make the above change, so I can’t show it properly here…hopefully the description makes enough sense.

#wrapper {
	margin-right: 10px;
	margin-right: 1.0rem;
	width: 100%;
	min-height: 100%;
	position: relative;
}
#page {
	padding-bottom: 24px;
	padding-bottom: 2.4rem;
}

(It just seems that there is a padding between the left sidebar and the main content. When it’s at 100%, it’s right against the right edge….at 95%, there’s a small gap….at 90% there’s a bigger gap…but it’s always the same distance from the left)