title: Remove default white space document itext 7
body: <p>i use itext 7.1.9 for create the carrier lable bill.
  i want my bill have full with and height of the document, i set with table 100 percent or large width but my document still have something like default padding, i want to remove it.
  How can i do it.
  This is my result</p>
  <p><a href="https://i.stack.imgur.com/YWcW5.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/YWcW5.png" alt="enter image description here" /></a></p>
  <p>And i want to remove white space here</p>
  <p><a href="https://i.stack.imgur.com/UZ5H5.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/UZ5H5.png" alt="enter image description here" /></a></p>
  <p>Here is my code</p>
  <p><a href="https://i.stack.imgur.com/lXq3c.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/lXq3c.png" alt="enter image description here" /></a></p>