Kat,
Good question. Widget styling can go either way. Every theme needs to have some styling for widgets and most plugins, especially good ones, will respect that.
In Moonrise, we have a width set on the widgets so you can have multiple widgets on the home page and only have the “block” ones fill up the full width of the screen. You probably don’t want a Facebook like box going the full width.
We can make this widget full width though. Just paste this in your Custom CSS box and that should do it:
.widgets_on_page .widget {
width: 100%;
}
Let me know if you have any trouble,
Bill