Changes in style.css do not work

Hello everyone,

I’m using a child theme of twenty twelve. Latest WordPress version.

I noticed that for some stuff I would change in my child theme’s style.css, there would be no visible changes on the site. I for example wanted to remove the word-break in the sidebar widgets.
So I added following code:

.widget-area .widget {
	word-wrap: normal;
}

… to basically override the word-wrap in the original twenty twelve theme. It did nothing, so I tried this:

.widget-area .widget {
   	word-break: keep-all;
}

… which did nothing either, so I put this:

.widget-area .widget {
	word-wrap: normal;
   	word-break: keep-all;
}

But I was out of luck. The words in the widgets were still broken.

I don’t understand why I don’t see any changes? Anyone have an idea?

Thanks!