You can use the Margin link on the widget. Add numbers into the boxes to move the widgets to the left or right, or up or down. It can take some experimenting to get the result you are after.
You can also use the slider bar to give equal padding all around the sides. You will notice there are rem and px values. We suggest using rem when possible as this will enable your widget to have a fluid width (resizes automatically to fit the screen).
Please keep in mind that each style has its own borders for the area where you can add content, and you can't add widgets outside of that. One of the reasons why the styles have this region is to prevent people with smaller screens from having to scroll horizontally to see your page. This is something most people find very annoying, so we have tried hard to use styles that will look good on everyone's computer as much as possible.