[theme twentythirteen] Change the page width for the sidebar

Hi all,

I am making a kind of narrowcasting page.
Now i created a floting sidebar, but i cant find where to change the page width. I found some topics what looked alike it, but that doesnt work for me.

This is the page i am talking about.

Iff you see in the header to the search symbol, you see that the widgets in the floating side bar lines out with it.

Before you ask, yes i am using a child theme of twenty thirteen.

Allready tried this in the childs CSS:

.entry-header,
.entry-content,
.entry-summary,
.entry-meta {
	margin: right;
	max-width: 1208px;
	width: 100%;
}

.sidebar .entry-header,
.sidebar .entry-content,
.sidebar .entry-summary,
.sidebar .entry-meta {
	max-width: none;
	padding: 0px 40px 0px 50px;
}

I hope someone can help me. I also cant get rid of the padding size of the clock. But we can look after at when the first problem is fixed.

edit: forgot to mention that i only want the widgets some to the right.