Change width won't work on twenty eleven theme

something’s holding my page from getting wider.
i have been looking around for hours, but can’t find the mistake !

here’s the CSS settings on a child theme of twentyeleven – one column.

\
#page {
margin: 0.8em auto;
max-width: 1050px;
}
#content {
margin: 0 0% 0 0%;
width:100%;
}
.one-column #page {
max-width: 1050 px; !important;
}
.one-column #content {
margin: 0 0%;
width: 100%;
}
\
What am i doing wrong ?

https://www.elsginjols.com
Advice would be appreciated. Thanks in advance!