Publish a page broke the whole theme

Hello,

I’ve just published an impring page to my blog I am building. I’ve posted it in HTML. When I previewed the page it was all fine, but when I published it the whole CSS “destroyed”. It means that WP is not more loading it.
I had this problem also this noon, then I reinstalled WP and all was well. Thought it was a Plugin but it was the page.
How to fix it? It’s a child theme of twentyeleven. Twentyeleven still works fine when I activate it again.

You can look at it at: https://bit.ly/L2NARF
Would be great when you can help. I just don’t find the mistake, still all new to this, but doing progresses.

Regards