Gutenberg blocks not correct in pdf

If I generate pdf from a classic block, PDF&Print works correctly. The right margin is about 2-2.5 cm.

If I generate a pdf from paragraph blocks (new WP block editor), the right margin is very wide. About 30% of the page. How can we get normal margins when the text was entered with the Gutenberg block editor ?

This is my additional css (for output)

body p { 
    font-family: Arial;
  font-size: 10pt;
  margin: 0px 0px 5px 0px;
}
h1 a {
  font-family: Arial;
  font-size: 18 pt;
  color: #000000;
}
li {font-family: Arial;
  font-size: 10pt;
}
h3 {margin: 0px 0px 0px 0px;
}

Frans