Hi Shay,
Your page is inside a Container and that is why it is quite far from the navbar.
You can click on Edit Page on your top WordPress Admin Bar, Once you are on the backend editor, you will find just below the blue update button on the right > Page Attributes > Templates : Select: Blank No Container Header Footer.
Regarding the size of your widget you could try adjusting the left and right margins of the section where your Widget is placed to something around 30% each side. Another alternative would be to divide the section in 3 columns and place the widget in the middle one.
Let us know how it goes.
Joao