[3.1.x] Simples CSS3 Dropdown Menü

[InitArt]

CSS für ein Dropdown Menü, funktioniert nur im Header mit HTML 5 Templates, muss also ggf. angepasst werden.

LESS (Da ich nicht benötigte Variablen entfernt habe, sieht die Namensgebung u.U. etwas komisch aus )

@navBorderRadius: 5px;
.navBorderRadius (@navBorderRadius: 5px) {
	border-radius: @navBorderRadius;
	-webkit-border-radius: @navBorderRadius;
	-moz-border-radius: @navBorderRadius;
}

@navBackground: steelblue;
@navBackgroundHover: darken(steelblue, 10%);

@navColor: #222;
@navLinkColor: white;
@navLinkColorHover: white;
@navFont: "Trebuchet MS", Arial, sans-serif;

.navBoxShadow (@navBoxShadow: 0 0 3px 0 rgba(0,0,0,0.4)) {
	box-shadow: @navBoxShadow;
	-webkit-box-shadow: @navBoxShadow;
	-moz-box-shadow: @navBoxShadow;
}
.navTransition (@navTransition: all .2s ease-in-out) {
	transition: @navTransition;
	-webkit-transition: @navTransition;
	-moz-transition: @navTransition;
}

/* ==========================================================================
   Module: Navigation
   ========================================================================== */
nav ul {
	padding: 0;
	margin: 0;
	list-style-type: none;
	font-family: @navFont;
	color: @navColor;
}

nav ul li a,
nav ul li a:hover  {
	text-decoration: none;
	white-space: nowrap;
}

nav ul li span {
	cursor: default;
	white-space: nowrap;
}
/* Module: Header Navigation
   ========================================================================== */
header nav > ul {
	background: @navBackground;
	.navBorderRadius;
	.navBoxShadow;
}

header nav > ul > li {
	display: inline-block;
	text-align: center;
	margin-right: 1px;
	.navBorderRadius;
}

header nav ul li span,
header nav ul li a {
	color: @navLinkColor;
	display: block;
	padding: 0.625em 0.9375em;
}

header nav ul li a:hover {
	color: @navLinkColorHover;
}

header nav > ul > li:hover,
header nav > ul > li.active,
header nav > ul > li.trail {
	background: @navBackgroundHover;
	color: @navLinkColorHover;
}

header nav ul ul {
	position: absolute;
	opacity: 0;
	visibility: hidden;
	z-index: 1;
	padding: 8px 0 0 0;
	.navTransition;
}

header nav ul li:hover > ul {
	opacity: 1;
	visibility: visible;
}

header nav ul ul li{
	position: relative;
	background: @navBackgroundHover;
}

header nav ul ul li.first {
	.navBorderRadius(@navBorderRadius @navBorderRadius 0 0);
}

header nav ul ul li.last {
	.navBorderRadius(0 0 @navBorderRadius @navBorderRadius);
}

header nav ul ul li.first.last {
	.navBorderRadius;
}

header nav ul ul li:hover,
header nav ul ul li.active,
header nav ul ul li.trail {
	background: lighten(@navBackgroundHover, 10%);
}

header nav ul ul li.first:after {
	content: '';
	position: absolute;
	left: 25%;
	top: -6px;
	margin-left: -5px;
	border-style: solid;
	border-width: 0 5px 6px 5px;
	border-color: transparent transparent @navBackgroundHover transparent;
}

header nav ul ul li.first:hover:after,
header nav ul ul li.first.active:after,
header nav ul ul li.first.trail:after {
	border-color: transparent transparent lighten(@navBackgroundHover, 10%) transparent;
}

header nav ul ul ul {
	padding: 0 0 0 8px;
	left: 100%;
	top: 0;
}

header nav ul ul ul li.first:after {
	left: 0;
	top: 50%;
	margin-left: -6px;
	margin-top: -5px;
	border-width: 5px 6px 5px 0;
	border-color: transparent @navBackgroundHover transparent transparent;
}

header nav ul ul ul li.first:hover:after,
header nav ul ul ul li.first.active:after,
header nav ul ul ul li.first.trail:after {
	border-color: transparent lighten(@navBackgroundHover, 10%) transparent transparent;
}

CSS

/* ==========================================================================
   Module: Navigation
   ========================================================================== */
nav ul {
  padding: 0;
  margin: 0;
  list-style-type: none;
  font-family: "Trebuchet MS", Arial, sans-serif;
  color: #222222;
}
nav ul li a,
nav ul li a:hover {
  text-decoration: none;
  white-space: nowrap;
}
nav ul li span {
  cursor: default;
  white-space: nowrap;
}
/* Module: Header Navigation
   ========================================================================== */
header nav > ul {
  background: #4682b4;
  border-radius: 5px;
  -webkit-border-radius: 5px;
  -moz-border-radius: 5px;
  box-shadow: 0 0 3px 0 rgba(0, 0, 0, 0.4);
  -webkit-box-shadow: 0 0 3px 0 rgba(0, 0, 0, 0.4);
  -moz-box-shadow: 0 0 3px 0 rgba(0, 0, 0, 0.4);
}
header nav > ul > li {
  display: inline-block;
  text-align: center;
  margin-right: 1px;
  border-radius: 5px;
  -webkit-border-radius: 5px;
  -moz-border-radius: 5px;
}
header nav ul li span,
header nav ul li a {
  color: #ffffff;
  display: block;
  padding: 0.625em 0.9375em;
}
header nav ul li a:hover {
  color: #ffffff;
}
header nav > ul > li:hover,
header nav > ul > li.active,
header nav > ul > li.trail {
  background: #38678f;
  color: #ffffff;
}
header nav ul ul {
  position: absolute;
  opacity: 0;
  visibility: hidden;
  z-index: 1;
  padding: 8px 0 0 0;
  transition: all 0.2s ease-in-out;
  -webkit-transition: all 0.2s ease-in-out;
  -moz-transition: all 0.2s ease-in-out;
}
header nav ul li:hover > ul {
  opacity: 1;
  visibility: visible;
}
header nav ul ul li {
  position: relative;
  background: #38678f;
}
header nav ul ul li.first {
  border-radius: 5px 5px 0 0;
  -webkit-border-radius: 5px 5px 0 0;
  -moz-border-radius: 5px 5px 0 0;
}
header nav ul ul li.last {
  border-radius: 0 0 5px 5px;
  -webkit-border-radius: 0 0 5px 5px;
  -moz-border-radius: 0 0 5px 5px;
}
header nav ul ul li.first.last {
  border-radius: 5px;
  -webkit-border-radius: 5px;
  -moz-border-radius: 5px;
}
header nav ul ul li:hover,
header nav ul ul li.active,
header nav ul ul li.trail {
  background: #4682b4;
}
header nav ul ul li.first:after {
  content: '';
  position: absolute;
  left: 25%;
  top: -6px;
  margin-left: -5px;
  border-style: solid;
  border-width: 0 5px 6px 5px;
  border-color: transparent transparent #38678f transparent;
}
header nav ul ul li.first:hover:after,
header nav ul ul li.first.active:after,
header nav ul ul li.first.trail:after {
  border-color: transparent transparent #4682b4 transparent;
}
header nav ul ul ul {
  padding: 0 0 0 8px;
  left: 100%;
  top: 0;
}
header nav ul ul ul li.first:after {
  left: 0;
  top: 50%;
  margin-left: -6px;
  margin-top: -5px;
  border-width: 5px 6px 5px 0;
  border-color: transparent #38678f transparent transparent;
}
header nav ul ul ul li.first:hover:after,
header nav ul ul ul li.first.active:after,
header nav ul ul ul li.first.trail:after {
  border-color: transparent #4682b4 transparent transparent;
}

[InitArt]

Die aktuelle Version, getestet mit Contao 3.1.x
Falls Interesse besteht, kann ich auch wieder den LESS Code bereitstellen.

header .mod_navigation ul li,
section#content .mod_navigation ul li,
footer .mod_navigation ul li,
header .mod_customnav ul li,
section#content .mod_customnav ul li,
footer .mod_customnav ul li {
  position: relative;
}
header .mod_navigation ul li:hover > ul,
section#content .mod_navigation ul li:hover > ul,
footer .mod_navigation ul li:hover > ul,
header .mod_customnav ul li:hover > ul,
section#content .mod_customnav ul li:hover > ul,
footer .mod_customnav ul li:hover > ul {
  opacity: 1;
  visibility: visible;
  -webkit-transition: all 0.2s ease-in-out;
  -moz-transition: all 0.2s ease-in-out;
  -o-transition: all 0.2s ease-in-out;
  transition: all 0.2s ease-in-out;
}
header .mod_navigation ul ul,
section#content .mod_navigation ul ul,
footer .mod_navigation ul ul,
header .mod_customnav ul ul,
section#content .mod_customnav ul ul,
footer .mod_customnav ul ul {
  position: absolute;
  opacity: 0;
  visibility: hidden;
  z-index: 300;
  border: #dddddd;
  background: #ffffff;
}
header .mod_navigation ul ul li,
section#content .mod_navigation ul ul li,
footer .mod_navigation ul ul li,
header .mod_customnav ul ul li,
section#content .mod_customnav ul ul li,
footer .mod_customnav ul ul li {
  text-align: left;
}
header .mod_navigation ul ul li a,
section#content .mod_navigation ul ul li a,
footer .mod_navigation ul ul li a,
header .mod_customnav ul ul li a,
section#content .mod_customnav ul ul li a,
footer .mod_customnav ul ul li a,
header .mod_navigation ul ul li span,
section#content .mod_navigation ul ul li span,
footer .mod_navigation ul ul li span,
header .mod_customnav ul ul li span,
section#content .mod_customnav ul ul li span,
footer .mod_customnav ul ul li span {
  min-width: 100px;
  padding: 0.15em 0.6em;
  margin: 0 0 0.15em;
  background: transparent;
  color: #333333;
}
header .mod_navigation ul ul li a.last,
section#content .mod_navigation ul ul li a.last,
footer .mod_navigation ul ul li a.last,
header .mod_customnav ul ul li a.last,
section#content .mod_customnav ul ul li a.last,
footer .mod_customnav ul ul li a.last,
header .mod_navigation ul ul li span.last,
section#content .mod_navigation ul ul li span.last,
footer .mod_navigation ul ul li span.last,
header .mod_customnav ul ul li span.last,
section#content .mod_customnav ul ul li span.last,
footer .mod_customnav ul ul li span.last {
  margin: 0;
}
header .mod_navigation ul ul li:hover > a,
section#content .mod_navigation ul ul li:hover > a,
footer .mod_navigation ul ul li:hover > a,
header .mod_customnav ul ul li:hover > a,
section#content .mod_customnav ul ul li:hover > a,
footer .mod_customnav ul ul li:hover > a {
  background: #f2f2f2;
  color: #333333;
}
header .mod_navigation ul ul li span.active,
section#content .mod_navigation ul ul li span.active,
footer .mod_navigation ul ul li span.active,
header .mod_customnav ul ul li span.active,
section#content .mod_customnav ul ul li span.active,
footer .mod_customnav ul ul li span.active {
  background: #f2f2f2;
  color: #333333;
}
header .mod_navigation ul ul li span.forward,
section#content .mod_navigation ul ul li span.forward,
footer .mod_navigation ul ul li span.forward,
header .mod_customnav ul ul li span.forward,
section#content .mod_customnav ul ul li span.forward,
footer .mod_customnav ul ul li span.forward {
  background: #f2f2f2;
  color: #333333;
}
header .mod_navigation ul ul li a.trail,
section#content .mod_navigation ul ul li a.trail,
footer .mod_navigation ul ul li a.trail,
header .mod_customnav ul ul li a.trail,
section#content .mod_customnav ul ul li a.trail,
footer .mod_customnav ul ul li a.trail {
  background: #f2f2f2;
  color: #333333;
}
header .mod_navigation ul ul li.first:before,
section#content .mod_navigation ul ul li.first:before,
footer .mod_navigation ul ul li.first:before,
header .mod_customnav ul ul li.first:before,
section#content .mod_customnav ul ul li.first:before,
footer .mod_customnav ul ul li.first:before {
  position: absolute;
  content: '';
  top: -6px;
  left: 16px;
  border: 6px solid transparent;
  border-top-width: 0;
  border-bottom-color: #ffffff;
  z-index: 350;
}
header .mod_navigation ul ul li.first:hover:before,
section#content .mod_navigation ul ul li.first:hover:before,
footer .mod_navigation ul ul li.first:hover:before,
header .mod_customnav ul ul li.first:hover:before,
section#content .mod_customnav ul ul li.first:hover:before,
footer .mod_customnav ul ul li.first:hover:before {
  border-bottom-color: #f2f2f2;
}
header .mod_navigation ul ul li.first.active:before,
section#content .mod_navigation ul ul li.first.active:before,
footer .mod_navigation ul ul li.first.active:before,
header .mod_customnav ul ul li.first.active:before,
section#content .mod_customnav ul ul li.first.active:before,
footer .mod_customnav ul ul li.first.active:before {
  border-bottom-color: #f2f2f2;
}
header .mod_navigation ul ul li.first.forward:before,
section#content .mod_navigation ul ul li.first.forward:before,
footer .mod_navigation ul ul li.first.forward:before,
header .mod_customnav ul ul li.first.forward:before,
section#content .mod_customnav ul ul li.first.forward:before,
footer .mod_customnav ul ul li.first.forward:before {
  border-bottom-color: #f2f2f2;
}
header .mod_navigation ul ul li.first.trail:before,
section#content .mod_navigation ul ul li.first.trail:before,
footer .mod_navigation ul ul li.first.trail:before,
header .mod_customnav ul ul li.first.trail:before,
section#content .mod_customnav ul ul li.first.trail:before,
footer .mod_customnav ul ul li.first.trail:before {
  border-bottom-color: #f2f2f2;
}
header .mod_navigation ul ul li.first:after,
section#content .mod_navigation ul ul li.first:after,
footer .mod_navigation ul ul li.first:after,
header .mod_customnav ul ul li.first:after,
section#content .mod_customnav ul ul li.first:after,
footer .mod_customnav ul ul li.first:after {
  position: absolute;
  content: '';
  top: -7px;
  left: 15px;
  border: 7px solid transparent;
  border-top-width: 0;
  border-bottom-color: #dddddd;
  z-index: 300;
}
header .mod_navigation ul ul ul,
section#content .mod_navigation ul ul ul,
footer .mod_navigation ul ul ul,
header .mod_customnav ul ul ul,
section#content .mod_customnav ul ul ul,
footer .mod_customnav ul ul ul {
  top: -1px;
  left: 100%;
}
header .mod_navigation ul ul ul li.first:before,
section#content .mod_navigation ul ul ul li.first:before,
footer .mod_navigation ul ul ul li.first:before,
header .mod_customnav ul ul ul li.first:before,
section#content .mod_customnav ul ul ul li.first:before,
footer .mod_customnav ul ul ul li.first:before {
  position: absolute;
  content: '';
  top: 50%;
  left: -6px;
  margin-top: -6px;
  border: 6px solid transparent;
  border-left-width: 0;
  border-right-color: #ffffff;
  z-index: 350;
}
header .mod_navigation ul ul ul li.first:hover:before,
section#content .mod_navigation ul ul ul li.first:hover:before,
footer .mod_navigation ul ul ul li.first:hover:before,
header .mod_customnav ul ul ul li.first:hover:before,
section#content .mod_customnav ul ul ul li.first:hover:before,
footer .mod_customnav ul ul ul li.first:hover:before {
  border-right-color: #f2f2f2;
}
header .mod_navigation ul ul ul li.first.active:before,
section#content .mod_navigation ul ul ul li.first.active:before,
footer .mod_navigation ul ul ul li.first.active:before,
header .mod_customnav ul ul ul li.first.active:before,
section#content .mod_customnav ul ul ul li.first.active:before,
footer .mod_customnav ul ul ul li.first.active:before {
  border-right-color: #f2f2f2;
}
header .mod_navigation ul ul ul li.first.forward:before,
section#content .mod_navigation ul ul ul li.first.forward:before,
footer .mod_navigation ul ul ul li.first.forward:before,
header .mod_customnav ul ul ul li.first.forward:before,
section#content .mod_customnav ul ul ul li.first.forward:before,
footer .mod_customnav ul ul ul li.first.forward:before {
  border-right-color: #f2f2f2;
}
header .mod_navigation ul ul ul li.first.trail:before,
section#content .mod_navigation ul ul ul li.first.trail:before,
footer .mod_navigation ul ul ul li.first.trail:before,
header .mod_customnav ul ul ul li.first.trail:before,
section#content .mod_customnav ul ul ul li.first.trail:before,
footer .mod_customnav ul ul ul li.first.trail:before {
  border-right-color: #f2f2f2;
}
header .mod_navigation ul ul ul li.first:hover:before,
section#content .mod_navigation ul ul ul li.first:hover:before,
footer .mod_navigation ul ul ul li.first:hover:before,
header .mod_customnav ul ul ul li.first:hover:before,
section#content .mod_customnav ul ul ul li.first:hover:before,
footer .mod_customnav ul ul ul li.first:hover:before,
header .mod_navigation ul ul ul li.first.active:before,
section#content .mod_navigation ul ul ul li.first.active:before,
footer .mod_navigation ul ul ul li.first.active:before,
header .mod_customnav ul ul ul li.first.active:before,
section#content .mod_customnav ul ul ul li.first.active:before,
footer .mod_customnav ul ul ul li.first.active:before,
header .mod_navigation ul ul ul li.first.forward:before,
section#content .mod_navigation ul ul ul li.first.forward:before,
footer .mod_navigation ul ul ul li.first.forward:before,
header .mod_customnav ul ul ul li.first.forward:before,
section#content .mod_customnav ul ul ul li.first.forward:before,
footer .mod_customnav ul ul ul li.first.forward:before,
header .mod_navigation ul ul ul li.first.trail:before,
section#content .mod_navigation ul ul ul li.first.trail:before,
footer .mod_navigation ul ul ul li.first.trail:before,
header .mod_customnav ul ul ul li.first.trail:before,
section#content .mod_customnav ul ul ul li.first.trail:before,
footer .mod_customnav ul ul ul li.first.trail:before {
  border-bottom-color: transparent;
}
header .mod_navigation ul ul ul li.first:after,
section#content .mod_navigation ul ul ul li.first:after,
footer .mod_navigation ul ul ul li.first:after,
header .mod_customnav ul ul ul li.first:after,
section#content .mod_customnav ul ul ul li.first:after,
footer .mod_customnav ul ul ul li.first:after {
  position: absolute;
  content: '';
  top: 50%;
  left: -7px;
  margin-top: -7px;
  border: 7px solid transparent;
  border-left-width: 0;
  border-right-color: #dddddd;
  z-index: 300;
}
header .mod_navigation > ul > li.last > ul,
section#content .mod_navigation > ul > li.last > ul,
footer .mod_navigation > ul > li.last > ul,
header .mod_customnav > ul > li.last > ul,
section#content .mod_customnav > ul > li.last > ul,
footer .mod_customnav > ul > li.last > ul {
  right: 0;
}
header .mod_navigation > ul > li.last > ul > li.first:before,
section#content .mod_navigation > ul > li.last > ul > li.first:before,
footer .mod_navigation > ul > li.last > ul > li.first:before,
header .mod_customnav > ul > li.last > ul > li.first:before,
section#content .mod_customnav > ul > li.last > ul > li.first:before,
footer .mod_customnav > ul > li.last > ul > li.first:before {
  right: 16px;
  left: auto;
}
header .mod_navigation > ul > li.last > ul > li.first:after,
section#content .mod_navigation > ul > li.last > ul > li.first:after,
footer .mod_navigation > ul > li.last > ul > li.first:after,
header .mod_customnav > ul > li.last > ul > li.first:after,
section#content .mod_customnav > ul > li.last > ul > li.first:after,
footer .mod_customnav > ul > li.last > ul > li.first:after {
  right: 15px;
  left: auto;
}
header .mod_navigation > ul > li.last > ul ul,
section#content .mod_navigation > ul > li.last > ul ul,
footer .mod_navigation > ul > li.last > ul ul,
header .mod_customnav > ul > li.last > ul ul,
section#content .mod_customnav > ul > li.last > ul ul,
footer .mod_customnav > ul > li.last > ul ul {
  right: 100%;
  left: auto;
}
header .mod_navigation > ul > li.last > ul ul li.first:before,
section#content .mod_navigation > ul > li.last > ul ul li.first:before,
footer .mod_navigation > ul > li.last > ul ul li.first:before,
header .mod_customnav > ul > li.last > ul ul li.first:before,
section#content .mod_customnav > ul > li.last > ul ul li.first:before,
footer .mod_customnav > ul > li.last > ul ul li.first:before {
  right: -6px;
  left: auto;
  border: 6px solid transparent;
  border-right-width: 0;
  border-left-color: #ffffff;
}
header .mod_navigation > ul > li.last > ul ul li.first:hover:before,
section#content .mod_navigation > ul > li.last > ul ul li.first:hover:before,
footer .mod_navigation > ul > li.last > ul ul li.first:hover:before,
header .mod_customnav > ul > li.last > ul ul li.first:hover:before,
section#content .mod_customnav > ul > li.last > ul ul li.first:hover:before,
footer .mod_customnav > ul > li.last > ul ul li.first:hover:before {
  border-left-color: #f2f2f2;
}
header .mod_navigation > ul > li.last > ul ul li.first.active:before,
section#content .mod_navigation > ul > li.last > ul ul li.first.active:before,
footer .mod_navigation > ul > li.last > ul ul li.first.active:before,
header .mod_customnav > ul > li.last > ul ul li.first.active:before,
section#content .mod_customnav > ul > li.last > ul ul li.first.active:before,
footer .mod_customnav > ul > li.last > ul ul li.first.active:before {
  border-left-color: #f2f2f2;
}
header .mod_navigation > ul > li.last > ul ul li.first.forward:before,
section#content .mod_navigation > ul > li.last > ul ul li.first.forward:before,
footer .mod_navigation > ul > li.last > ul ul li.first.forward:before,
header .mod_customnav > ul > li.last > ul ul li.first.forward:before,
section#content .mod_customnav > ul > li.last > ul ul li.first.forward:before,
footer .mod_customnav > ul > li.last > ul ul li.first.forward:before {
  border-left-color: #f2f2f2;
}
header .mod_navigation > ul > li.last > ul ul li.first.trail:before,
section#content .mod_navigation > ul > li.last > ul ul li.first.trail:before,
footer .mod_navigation > ul > li.last > ul ul li.first.trail:before,
header .mod_customnav > ul > li.last > ul ul li.first.trail:before,
section#content .mod_customnav > ul > li.last > ul ul li.first.trail:before,
footer .mod_customnav > ul > li.last > ul ul li.first.trail:before {
  border-left-color: #f2f2f2;
}
header .mod_navigation > ul > li.last > ul ul li.first:after,
section#content .mod_navigation > ul > li.last > ul ul li.first:after,
footer .mod_navigation > ul > li.last > ul ul li.first:after,
header .mod_customnav > ul > li.last > ul ul li.first:after,
section#content .mod_customnav > ul > li.last > ul ul li.first:after,
footer .mod_customnav > ul > li.last > ul ul li.first:after {
  right: -7px;
  left: auto;
  border: 7px solid transparent;
  border-right-width: 0;
  border-left-color: #dddddd;
}