body {
  width: 600px;
  margin: 0 auto;
  padding: 0 20px 20px 20px;
  border: 5px solid black;
}

#next_block {
     padding-top: 20px;
	 padding-bottom: 5px;
  }

#list_item {
     padding: 0px;
}

#roman {
 list-style-type: lower-roman;
}

#square {
 list-style-type: square;
 margin-left: -2em;
}