em, strong, code
{
	/* Override font-style, otherwise the default font-style will be used.
		For example, em will use italic font-style.*/
	font-style: normal;
}

sub
{
	/*subscript presentation*/
	font-size:24px;
	background-color: black;
	color: white;
	vertical-align: inherit; 
}

p
{
	line-height: 130%
}

hr, div
{ 
	page-break-after: always;
}

h2
{
	text-align: center;
}
em, strong, code
{
	/* Override font-style, otherwise the default font-style will be used.
		For example, em will use italic font-style.*/
	font-style: normal;
}

sub
{
	/*subscript presentation*/
	font-size: 24px;
	background-color: black;
	color: white;
	vertical-align: baseline; 
}

p
{
	line-height: 130%
}

hr, div
{ 
	page-break-after: always;
}

h2
{
	text-align: center;
}
Use different sub style which has same effect: line height is enlarged
Use different sub style which has same effect: line height is enlarged
