title: When creating a pdf with itextpdf -PdfPTable while adding table in any of a row it's displaying a dark border at bottom
body: <p><a href="https://i.stack.imgur.com/JZ9f2.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/JZ9f2.png" alt="enter image description here"></a>
  While creating a table through itextpdf getting a dark border in a certain cell.
  But I have not specified any border had set only border color to gray. 
  Getting this only while viewing the PDF in Adobe Reader in 100% zoom. if zoom size is increased or decreased its border looks the same among all cell.</p>
  
  <p>Darker only when viewing the PDF with 100% zooming ratio.</p>
  
  <pre><code>PdfPTable contentTable = new PdfPTable(new float[] {3, 1, 1, 1, 1, 1, 1, 1});
  contentTable.setWidthPercentage(100);
  PdfPCell cell;
  cell = new PdfPCell(new Phrase(columnName, valueFont));
  cell.setHorizontalAlignment(Element.ALIGN_LEFT);
  cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
  cell.setBorderColor(BaseColor.GRAY);
  cell.setUseDescender(true);
  cell.setPaddingLeft(5f);
  contentTable.addCell(cell); 
  document.add(contentTable);
  </code></pre>