I have a screen that will be a dashboard and in it I have several panels that are li with float: left so that when the screen is resized, go passing the panels down and thus be responsive. My problem is that I need to leave these panels centered on the page and I only managed via javascript, how can I do it with css? Below is an image of how it is today, notice that it is not centralized, and if I set the margins when I resize the page it is all wrong.