Zend certified PHP/Magento developer

How to adjust table width on BOTH sides precisely in Microsoft Word (mac)?

I’m try to expand a table to an exact measurement on BOTH sides. When I use the width adjustments (see below, highlighted by green box) just the right side of the table expands.

I want to align the box that surrounds the heading “Electric Charges and Fields” and the table below. Currently, they are slightly misaligned (see below, pink boxes).

Also, is there a way to enter a precise value to adjust the ‘grid boxes’ that appear in the ruler bar when selecting the table (see below, pink circles)? Do these grid boxes have a proper name?

Image1, green boxes:

enter image description here

Image2, pink highlights:

enter image description here