margin: 20px auto 20px auto;

  margin-top: 20px;
  margin-bottom: 20px;
  margin-right: auto;
  margin-left: auto;


  <div style="margin-bottom:20px;"></div>

Feel free to comment if you can add help to this page or point out issues and solutions you have found. I do not provide support on this site, if you need help with a problem head over to stack overflow.