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Use em units rather than ex units for horizontal lengths.
John Gardner and others tell me it produces more predictable results
and is generally considered better style.
Also use 0em instead of 0ex, in general.

/* $Id: mandoc.css,v 1.30 2018/05/26 17:38:01 schwarze Exp $ */
/*
 * Standard style sheet for mandoc(1) -Thtml and man.cgi(8).
 */

/* Global defaults. */

html {		max-width: 65em; }
body {		font-family: Helvetica,Arial,sans-serif; }
table {		margin-top: 0em;
		margin-bottom: 0em; }
td {		vertical-align: top; }
ul, ol, dl {	margin-top: 0em;
		margin-bottom: 0em; }
li, dt {	margin-top: 1em; }

a.permalink {	border-bottom: thin dotted;
		color: inherit;
		font: inherit;
		text-decoration: inherit; }
* {		clear: both }

/* Search form and search results. */

fieldset {	border: thin solid silver;
		border-radius: 1em;
		text-align: center; }
input[name=expr] {
		width: 25%; }

table.results {	margin-top: 1em;
		margin-left: 2em;
		font-size: smaller; }

/* Header and footer lines. */

table.head {	width: 100%;
		border-bottom: 1px dotted #808080;
		margin-bottom: 1em;
		font-size: smaller; }
td.head-vol {	text-align: center; }
td.head-rtitle {
		text-align: right; }
div.Nd {	display: inline; }

table.foot {	width: 100%;
		border-top: 1px dotted #808080;
		margin-top: 1em;
		font-size: smaller; }
td.foot-os {	text-align: right; }

/* Sections and paragraphs. */

div.manual-text {
		margin-left: 3.8em; }
h1.Sh {		margin-top: 2ex;
		margin-bottom: 1ex;
		margin-left: -3.2em;
		font-size: 110%; }
h2.Ss {		margin-top: 2ex;
		margin-bottom: 1ex;
		margin-left: -1.2em;
		font-size: 105%; }
div.Pp {	margin: 1ex 0ex; }
a.Sx { }
a.Xr { }

/* Displays and lists. */

div.Bd { }
div.D1 {	margin-left: 3.8em; }

ul.Bl-bullet {	list-style-type: disc;
		padding-left: 1em; }
ul.Bl-bullet > li { }
ul.Bl-dash {	list-style-type: none;
		padding-left: 0em; }
ul.Bl-dash > li:before {
		content: "\2014  "; }
ul.Bl-item {	list-style-type: none;
		padding-left: 0em; }
ul.Bl-item > li { }
ul.Bl-compact > li {
		margin-top: 0em; }

ol.Bl-enum {	padding-left: 2em; }
ol.Bl-enum > li { }
ol.Bl-compact > li {
		margin-top: 0em; }

dl.Bl-diag { }
dl.Bl-diag > dt {
		font-style: normal;
		font-weight: bold; }
dl.Bl-diag > dd {
		margin-left: 0em; }
dl.Bl-hang { }
dl.Bl-hang > dt { }
dl.Bl-hang > dd {
		margin-left: 5.5em; }
dl.Bl-inset { }
dl.Bl-inset > dt { }
dl.Bl-inset > dd {
		margin-left: 0em; }
dl.Bl-ohang { }
dl.Bl-ohang > dt { }
dl.Bl-ohang > dd {
		margin-left: 0em; }
dl.Bl-tag {	margin-left: 5.5em; }
dl.Bl-tag > dt {
		float: left;
		margin-top: 0em;
		margin-left: -5.5em;
		padding-right: 1.2em;
		vertical-align: top; }
dl.Bl-tag > dd {
		clear: right;
		width: 100%;
		margin-top: 0em;
		margin-left: 0em;
		vertical-align: top;
		overflow: auto; }
dl.Bl-compact > dt {
		margin-top: 0em; }

table.Bl-column { }
table.Bl-column > tbody > tr { }
table.Bl-column > tbody > tr > td {
		margin-top: 1em; }
table.Bl-compact > tbody > tr > td {
		margin-top: 0em; }

cite.Rs {	font-style: normal;
		font-weight: normal; }
span.RsA { }
i.RsB {		font-weight: normal; }
span.RsC { }
span.RsD { }
i.RsI {		font-weight: normal; }
i.RsJ {		font-weight: normal; }
span.RsN { }
span.RsO { }
span.RsP { }
span.RsQ { }
span.RsR { }
span.RsT {	text-decoration: underline; }
a.RsU { }
span.RsV { }

span.eqn { }
table.tbl { }

/* Semantic markup for command line utilities. */

table.Nm { }
code.Nm {	font-style: normal;
		font-weight: bold;
		font-family: inherit; }
code.Fl {	font-style: normal;
		font-weight: bold;
		font-family: inherit; }
code.Cm {	font-style: normal;
		font-weight: bold;
		font-family: inherit; }
var.Ar {	font-style: italic;
		font-weight: normal; }
div.Op {	display: inline; }
code.Ic {	font-style: normal;
		font-weight: bold;
		font-family: inherit; }
code.Ev {	font-style: normal;
		font-weight: normal;
		font-family: monospace; }
span.Pa {	font-style: italic;
		font-weight: normal; }

/* Semantic markup for function libraries. */

span.Lb { }
code.In {	font-style: normal;
		font-weight: bold;
		font-family: inherit; }
a.In { }
code.Fd {	font-style: normal;
		font-weight: bold;
		font-family: inherit; }
var.Ft {	font-style: italic;
		font-weight: normal; }
code.Fn {	font-style: normal;
		font-weight: bold;
		font-family: inherit; }
var.Fa {	font-style: italic;
		font-weight: normal; }
var.Vt {	font-style: italic;
		font-weight: normal; }
var.Va {	font-style: italic;
		font-weight: normal; }
code.Dv {	font-style: normal;
		font-weight: normal;
		font-family: monospace; }
code.Er {	font-style: normal;
		font-weight: normal;
		font-family: monospace; }

/* Various semantic markup. */

span.An { }
a.Lk { }
a.Mt { }
code.Cd {	font-style: normal;
		font-weight: bold;
		font-family: inherit; }
span.Ad {	font-style: italic;
		font-weight: normal; }
span.Ms {	font-style: normal;
		font-weight: bold; }
span.St { }
a.Ux { }

/* Physical markup. */

.Bf {		display: inline; }
.No {		font-style: normal;
		font-weight: normal; }
.Em {		font-style: italic;
		font-weight: normal; }
.Sy {		font-style: normal;
		font-weight: bold; }
.Li {		font-style: normal;
		font-weight: normal;
		font-family: monospace; }