OK, the first thing you should know is that it doesn’t look like you created the child theme correctly. You are supposed to create a separate folder for the child theme, either by using an FTP client like FileZilla or your host’s control panel (cPanel). For example, the Twenty Fourteen theme’s folder looks like this:
/wp-content/themes/twentyfourteen
So you normally create a child folder that looks like this:
/wp-content/themes/twentyfourteen-child
And then you create your new style.css file in that folder.
Second, you don’t copy the entire contents of the parent style.css file over to the child theme’s file. This line of code automatically does that:
@import url("../twentyfourteen/style.css");
The only rules you need to include are any rules which you create that overrides or adds to the parent style.css file.
With all that being said, in most cases, if the only changes you are making is to the CSS, then you can do it much easier by using a CSS plugin. That way, you don’t need to create a child theme, you just add your CSS to the plugin’s custom CSS field. The plugin that I like is Custom CSS Manager.
When you say you can’t get the header to go all the way across, are you referring to the featured content? You are trying to move the left sidebar down and move the featured content to the left?
