server/core/css/header.scss

/**
 * @copyright Copyright (c) 2016, John Molakvoæ <skjnldsv@protonmail.com>
 * @copyright Copyright (c) 2016, Julius Haertl <jus@bitgrid.net>
 * @copyright Copyright (c) 2016, Lukas Reschke <lukas@statuscode.ch>
 * @copyright Copyright (c) 2016, Jos Poortvliet <jos@opensuse.org>
 * @copyright Copyright (c) 2016, Erik Pellikka <erik@pellikka.org>
 * @copyright Copyright (c) 2016, jowi <sjw@gmx.ch>
 * @copyright Copyright (c) 2015, Hendrik Leppelsack <hendrik@leppelsack.de>
 * @copyright Copyright (c) 2015, Volker E <volker.e@temporaer.net>
 * @copyright Copyright (c) 2014-2017, Jan-Christoph Borchardt <hey@jancborchardt.net>
 *
 * @license GNU AGPL version 3 or any later version
 *
 */

/* prevent ugly selection effect on accidental selection */
#header,
#navigation,
#expanddiv {
	-webkit-user-select: none;
	-moz-user-select: none;
	-ms-user-select: none;
}

/* Header menu */
.menu {
	position: absolute;
	top: 45px;
	background-color: #fff;
	box-shadow: 0 1px 10px rgba(150, 150, 150, 0.75);
	border-radius: 0 0 3px 3px;
	display: none;
	box-sizing: border-box;
	z-index: 2000;

	/* Dropdown arrow */
	&:after {
		border: 10px solid transparent;
		border-bottom-color: $color-main-background;
		bottom: 100%;
		content: ' ';
		height: 0;
		width: 0;
		position: absolute;
		pointer-events: none;
	}
}

/* removed until content-focusing issue is fixed */
#skip-to-content a {
	position: absolute;
	left: -10000px;
	top: auto;
	width: 1px;
	height: 1px;
	overflow: hidden;
	&:focus {
		left: 76px;
		top: -9px;
		color: $color-primary-text;
		width: auto;
		height: auto;
	}
}

/* HEADERS ------------------------------------------------------------------ */
#body-user #header,
#body-settings #header,
#body-public #header {
	display: inline-flex;
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	z-index: 2000;
	height: 45px;
	background-color: $color-primary;
	box-sizing: border-box;
	justify-content: space-between;
}

/* LOGO and APP NAME -------------------------------------------------------- */
#nextcloud {
	padding: 5px;
	padding-bottom: 0;
	height: 45px;
	/* header height */
	box-sizing: border-box;
	-ms-filter: 'progid:DXImageTransform.Microsoft.Alpha(Opacity=100)';
	opacity: 1;
	&:focus {
		-ms-filter: 'progid:DXImageTransform.Microsoft.Alpha(Opacity=75)';
		opacity: .75;
	}
	&:hover, &:active {
		-ms-filter: 'progid:DXImageTransform.Microsoft.Alpha(Opacity=100)';
		opacity: 1;
	}
}

#header {
	.logo {
		background-image: url('#{$image-logo}');
		background-repeat: no-repeat;
		background-size: 175px;
		background-position: center;
		width: 252px;
		height: 120px;
		margin: 0 auto;
	}
	.logo-icon {
		/* display logo so appname can be shown next to it */
		display: inline-block;
		background-image: url($image-logo);
		background-repeat: no-repeat;
		background-position: center center;
		background-size: contain;
		width: 62px;
		height: 34px;
	}
	.header-appname-container {
		display: none;
		padding-top: 22px;
		padding-right: 10px;
		flex-shrink: 0;
	}
	/* show caret indicator next to logo to make clear it is tappable */
	.icon-caret {
		display: inline-block;
		width: 12px;
		height: 12px;
		margin: 0;
		margin-top: -21px;
		padding: 0;
		vertical-align: middle;
	}

	#header-left,
	#header-right {
		display: inline-flex;
		align-items: center;
	}

	#header-left {
		flex: 0 0;
		flex-grow: 1;
	}

	#header-right {
		justify-content: flex-end;
	}
}

/* hover effect for app switcher label */

.header-appname-container .header-appname {
	-ms-filter: 'progid:DXImageTransform.Microsoft.Alpha(Opacity=75)';
	opacity: .75;
}

.menutoggle {
	.icon-caret {
		-ms-filter: 'progid:DXImageTransform.Microsoft.Alpha(Opacity=75)';
		opacity: .75;
	}
	&:hover {
		.header-appname, .icon-caret {
			-ms-filter: 'progid:DXImageTransform.Microsoft.Alpha(Opacity=100)';
			opacity: 1;
		}
	}
	&:focus {
		.header-appname, .icon-caret {
			-ms-filter: 'progid:DXImageTransform.Microsoft.Alpha(Opacity=100)';
			opacity: 1;
		}
	}
	&.active {
		.header-appname, .icon-caret {
			-ms-filter: 'progid:DXImageTransform.Microsoft.Alpha(Opacity=100)';
			opacity: 1;
		}
	}
}

/* show appname next to logo */
.header-appname {
	display: inline-block;
	position: relative;
	color: $color-primary-text;
	font-size: 16px;
	font-weight: 300;
	margin: 0;
	margin-top: -26px;
	padding: 7px 0 7px 5px;
	vertical-align: middle;
}

/* do not show menu toggle on public share links as there is no menu */
#body-public #header .icon-caret {
	display: none;
}

/* NAVIGATION --------------------------------------------------------------- */
nav {
	display: inline-block;
	width: 44px;
	height: 44px;
	margin-left: -54px;
}

#navigation {
	position: relative;
	left: -100%;
	width: 160px;
	background-color: $color-main-background;
	box-shadow: 0 1px 10px $color-box-shadow;
	&:after {
		/* position of dropdown arrow */
		left: 47%;
		bottom: 100%;
		border: solid transparent;
		content: ' ';
		height: 0;
		width: 0;
		position: absolute;
		pointer-events: none;
		border-color: rgba(0, 0, 0, 0);
		border-bottom-color: rgba(255, 255, 255, .97);
		border-width: 9px;
		margin-left: -9px;
	}
}

/* arrow look */

#expanddiv:after {
	bottom: 100%;
	border: solid transparent;
	content: ' ';
	height: 0;
	width: 0;
	position: absolute;
	pointer-events: none;
	border-color: rgba(0, 0, 0, 0);
	border-bottom-color: rgba(255, 255, 255, .97);
	border-width: 10px;
	margin-left: -10px;
}

#navigation {
	box-sizing: border-box;
	* {
		box-sizing: border-box;
	}
	li {
		display: inline-block;
	}
	a {
		position: relative;
		display: block;
		padding: 10px 12px;
		height:40px;
		vertical-align: text-bottom;
		span {
			display: inline-block;
			padding-bottom: 0;
			padding-left: 10px;
			color: $color-main-text;
			white-space: nowrap;
			overflow: hidden;
			text-overflow: ellipsis;
		}
		svg,
		span {
			-ms-filter: 'progid:DXImageTransform.Microsoft.Alpha(Opacity=50)';
			opacity: .5;
		}
		svg {
			margin-bottom: 2px;
		}
		&:hover svg,
		&:focus svg,
		&:hover span,
		&:focus span {
			-ms-filter: 'progid:DXImageTransform.Microsoft.Alpha(Opacity=100)';
			opacity: 1;
		}
		&.active {
			svg, span {
				-ms-filter: 'progid:DXImageTransform.Microsoft.Alpha(Opacity=100)';
				opacity: 1;
			}
		}
	}
	.app-icon {
		margin: 0 auto;
		padding: 0;
		max-height: 32px;
		max-width: 32px;
	}

}

/* loading feedback for apps */
.app-loading {
	.icon-loading-small-dark {
		display: inline !important;
		position: absolute;
		left: 12px;
		width: 16px;
		height: 16px;
	}
	.app-icon {
		-ms-filter: 'progid:DXImageTransform.Microsoft.Alpha(Opacity=0)';
		opacity: 0;
	}
}

/* Apps management */

#apps {
	max-height: calc(100vh - 100px);
	overflow: auto;
	.in-header {
		display: none;
	}
}

/* USER MENU -----------------------------------------------------------------*/

#settings {
	display: inline-block;
	color: rgba($color-primary-text, 0.7);
	cursor: pointer;
	.icon-loading-small-dark {
		display: inline-block;
		margin-bottom: -3px;
		margin-right: 6px;
		background-size: 16px 16px;
	}
	flex: 0 0 auto;
}

/* User menu on the right */
#expand {
	position: relative;
	display: flex;
	align-items: center;
	padding: 7px 20px 6px 10px;
	cursor: pointer;
	* {
		cursor: pointer;
	}
	img {
		-ms-filter: 'progid:DXImageTransform.Microsoft.Alpha(Opacity=70)';
		opacity: .7;
		margin-bottom: -2px;
	}
	&:hover,
	&:focus,
	&:active {
		color: $color-primary-text;
		img,
		#expandDisplayName {
			-ms-filter: 'progid:DXImageTransform.Microsoft.Alpha(Opacity=100)';
			opacity: 1;
		}
	}

	/* Profile picture in header */
	.avatardiv {
		cursor: pointer;
		height: 32px;
		width: 32px;
		img {
			opacity: 1;
			cursor: pointer;
		}
		/* do not show display name when profile picture is present */
		&.avatardiv-shown + #expandDisplayName {
			display: none;
		}
	}

	#expandDisplayName {
		padding: 8px;
		opacity: .6;
	}
}

/* full opacity for gear icon if active */
#body-settings #expandDisplayName {
	opacity: 1;
}

/* show triangle below user menu if active */
#body-settings #expand:before {
	content: ' ';
	height: 0;
	width: 0;
	position: absolute;
	pointer-events: none;
	border: 0 solid transparent;
	border-bottom-color: white;
	border-width: 10px;
	transform: translateX(-50%);
	left: 26px;
	bottom: 0;
	z-index: 100;
	display: block;
}

#expanddiv {
	right: 13px;
	background: $color-main-background;
	box-shadow: 0 1px 10px $color-box-shadow;
	&:after {
		/* position of dropdown arrow */
		right: 13px;
	}
	a {
		display: block;
		height: 40px;
		color: $color-main-text;
		opacity: .5;
		padding: 10px 12px 0;
		-ms-filter: 'progid:DXImageTransform.Microsoft.Alpha(Opacity=50)';
		box-sizing: border-box;
		img {
			margin-bottom: -3px;
			margin-right: 6px;
		}
		&:hover,
		&:focus,
		&:active,
		&.active {
			-ms-filter: 'progid:DXImageTransform.Microsoft.Alpha(Opacity=100)';
			opacity: 1;
		}
	}
}

#appmenu {
	display: inline-block;
	width: auto;
	clear: both;
	height: 44px;

	li {
		float: left;
		display: inline-block;
		position: relative;
		vertical-align: top !important;
		height: 45px;
		cursor: pointer;

		a {
			position: relative;
			display: inline-block;
			margin: 0;
			padding: 12px;
			height: 21px;
			text-align: center;
			vertical-align: top !important;
			opacity: .6;
		}
	}
	.app-loading .icon-loading-small-dark {
		top:12px;
	}


	li:hover a,
	li a.active {
		opacity: 1;
	}

	li img,
	.icon-more-white {
		display: inline-block;
		width: 20px;
		height: 20px;
	}

	li span {
		display: none;
		position: absolute;
		overflow: visible;
		background-color: rgba(255, 255, 255, .97);
		white-space: nowrap;
		border: none;
		-webkit-border-radius: 3px;
		-moz-border-radius: 3px;
		border-radius: 3px;
		border-top-left-radius: 0;
		border-top-right-radius: 0;
		margin-top: 0;
		color: rgba(0, 0, 0, .6);
		width: auto;
		left: 50%;
		top: 45px;
		transform: translateX(-50%);
		padding: 4px 10px;
		-webkit-filter: drop-shadow(0 0 5px rgba(150, 150, 150, .75));
		-moz-filter: drop-shadow(0 0 5px rgba(150, 150, 150, .75));
		-ms-filter: drop-shadow(0 0 5px rgba(150, 150, 150, .75));
		-o-filter: drop-shadow(0 0 5px rgba(150, 150, 150, .75));
		filter: drop-shadow(0 0 5px rgba(150, 150, 150, .75));
	}

	li:hover span {
		display: inline-block;
	}

	/* show triangle below active app */
	li:hover a:before,
	li a.active:before {
		content: ' ';
		height: 0;
		width: 0;
		position: absolute;
		pointer-events: none;
		border: 0 solid transparent;
		border-bottom-color: white;
		border-width: 10px;
		transform: translateX(-50%);
		left: 50%;
		bottom: 0;
		z-index: 100;
		display: block;
	}
	&.menu-open li:hover a:before,
	&.menu-open li a.active:before,
	&.menu-open li:hover span {
		display: none !important;
	}

	li.hidden {
		display: none;
	}
}