Edit: admin-menu.css

#adminmenuback,
#adminmenuwrap,
#adminmenu,
#adminmenu .wp-submenu {
	width: 160px;
	background-color: #1d2327;
}

#adminmenuback {
	position: fixed;
	top: 0;
	bottom: -120px;
	z-index: 1; /* positive z-index to avoid elastic scrolling woes in Safari */

/* Only visible in Windows High Contrast mode */
	outline: 1px solid transparent;
}

.php-error #adminmenuback {
	position: absolute;
}

.php-error #adminmenuback,
.php-error #adminmenuwrap {
	margin-top: 2em;
}

#adminmenu {
	clear: left;
	margin: 12px 0;
	padding: 0;
	list-style: none;
}

.folded #adminmenuback,
.folded #adminmenuwrap,
.folded #adminmenu,
.folded #adminmenu li.menu-top {
	width: 36px;
}

/* New Menu icons */

/* hide background-image for icons above */
.menu-icon-dashboard div.wp-menu-image,
.menu-icon-post div.wp-menu-image,
.menu-icon-media div.wp-menu-image,
.menu-icon-links div.wp-menu-image,
.menu-icon-page div.wp-menu-image,
.menu-icon-comments div.wp-menu-image,
.menu-icon-appearance div.wp-menu-image,
.menu-icon-plugins div.wp-menu-image,
.menu-icon-users div.wp-menu-image,
.menu-icon-tools div.wp-menu-image,
.menu-icon-settings div.wp-menu-image,
.menu-icon-site div.wp-menu-image,
.menu-icon-generic div.wp-menu-image {
	background-image: none !important;
}

/*------------------------------------------------------------------------------
  7.0 - Main Navigation (Left Menu)
------------------------------------------------------------------------------*/

#adminmenuwrap {
	position: relative;
	float: left;
	z-index: 9990;
}

/* side admin menu */
#adminmenu * {
	-webkit-user-select: none;
	user-select: none;
}

#adminmenu li {
	margin: 0;
	padding: 0;
}

#adminmenu a {
	display: block;
	line-height: 1.3;
	padding: 2px 5px;
	color: #f0f0f1;
}

#adminmenu .wp-submenu a {
	color: #c3c4c7;
	color: rgba(240, 246, 252, 0.7);
	font-size: 13px;
	line-height: 1.4;
	margin: 0;
	padding: 5px 0;
}

#adminmenu .wp-submenu a:hover,
#adminmenu .wp-submenu a:focus {
	background: none;
}

#adminmenu a:hover,
#adminmenu li.menu-top > a:focus,
#adminmenu .wp-submenu a:hover,
#adminmenu .wp-submenu a:focus {
	color: #72aee6;
}

#adminmenu a:hover,
#adminmenu a:focus,
.folded #adminmenu .wp-submenu-head:hover {
	box-shadow: inset 4px 0 0 0 currentColor;
	transition: box-shadow .1s linear;
}

#adminmenu li.menu-top {
	border: none;
	min-height: 34px;
	position: relative;
}

#adminmenu .wp-submenu {
	list-style: none;
	position: absolute;
	top: -1000em;
	left: 160px;
	overflow: visible;
	word-wrap: break-word;
	padding: 6px 0;
	z-index: 9999;
	background-color: #2c3338;
	box-shadow: 0 3px 5px rgba(0, 0, 0, 0.2);
}

.js #adminmenu .sub-open,
.js #adminmenu .opensub .wp-submenu,
#adminmenu a.menu-top:focus + .wp-submenu,
.no-js li.wp-has-submenu:hover .wp-submenu {
	top: -1px;
}

#adminmenu a.wp-has-current-submenu:focus + .wp-submenu {
	top: 0;
}

#adminmenu .wp-has-current-submenu .wp-submenu,
.no-js li.wp-has-current-submenu:hover .wp-submenu,
#adminmenu .wp-has-current-submenu .wp-submenu.sub-open,
#adminmenu .wp-has-current-submenu.opensub .wp-submenu {
	position: relative;
	z-index: 3;
	top: auto;
	left: auto;
	right: auto;
	bottom: auto;
	border: 0 none;
	margin-top: 0;
	box-shadow: none;
}

.folded #adminmenu .wp-has-current-submenu .wp-submenu {
	box-shadow: 0 3px 5px rgba(0, 0, 0, 0.2);
}

/* ensure that wp-submenu's box shadow doesn't appear on top of the focused menu item's background. */
#adminmenu li.menu-top:hover,
#adminmenu li.opensub > a.menu-top,
#adminmenu li > a.menu-top:focus {
	position: relative;
	background-color: #1d2327;
	color: #72aee6;
}

.folded #adminmenu li.menu-top:hover,
.folded #adminmenu li.opensub > a.menu-top,
.folded #adminmenu li > a.menu-top:focus {
	z-index: 10000;
}

#adminmenu li.wp-has-current-submenu a.wp-has-current-submenu,
#adminmenu li.current a.menu-top,
#adminmenu .wp-has-current-submenu .wp-submenu .wp-submenu-head {
	background: #2271b1;
	color: #fff;
}

.folded #adminmenu .wp-submenu.sub-open,
.folded #adminmenu .opensub .wp-submenu,
.folded #adminmenu .wp-has-current-submenu .wp-submenu.sub-open,
.folded #adminmenu .wp-has-current-submenu.opensub .wp-submenu,
.folded #adminmenu a.menu-top:focus + .wp-submenu,
.folded #adminmenu .wp-has-current-submenu a.menu-top:focus + .wp-submenu,
.no-js.folded #adminmenu .wp-has-submenu:hover .wp-submenu {
	top: 0;
	left: 36px;
}

.folded #adminmenu a.wp-has-current-submenu:focus + .wp-submenu,
.folded #adminmenu .wp-has-current-submenu .wp-submenu {
	position: absolute;
	top: -1000em;
}

#adminmenu .wp-not-current-submenu .wp-submenu,
.folded #adminmenu .wp-has-current-submenu .wp-submenu {
	min-width: 160px;
	width: auto;
	border: 1px solid transparent;
	border-left-width: 5px;
}

#adminmenu .wp-submenu li.current,
#adminmenu .wp-submenu li.current a,
#adminmenu .opensub .wp-submenu li.current a,
#adminmenu a.wp-has-current-submenu:focus + .wp-submenu li.current a,
#adminmenu .wp-submenu li.current a:hover,
#adminmenu .wp-submenu li.current a:focus {
	color: #fff;
}

#adminmenu .wp-not-current-submenu li > a,
.folded #adminmenu .wp-has-current-submenu li > a {
	padding-right: 16px;
	padding-left: 14px;
	/* Exclude from the transition the outline for Windows High Contrast mode */
	transition: all .1s ease-in-out, outline 0s;
}

#adminmenu .wp-has-current-submenu ul > li > a,
.folded #adminmenu li.menu-top .wp-submenu > li > a {
	padding: 5px 12px;
}

#adminmenu a.menu-top,
#adminmenu .wp-submenu-head {
	font-size: 14px;
	font-weight: 400;
	line-height: 1.3;
	padding: 0;
}

#adminmenu .wp-submenu-head {
	display: none;
}

.folded #adminmenu .wp-menu-name {
	position: absolute;
	left: -999px;
}

.folded #adminmenu .wp-submenu-head {
	display: block;
}

#adminmenu .wp-submenu li {
	padding: 0;
	margin: 0;
}

#adminmenu .wp-menu-image img {
	padding: 9px 0 0;
	opacity: 0.6;
	filter: alpha(opacity=60);
}

#adminmenu div.wp-menu-name {
	padding: 8px 8px 8px 36px;
	overflow-wrap: break-word;
	word-wrap: break-word;
	-ms-word-break: break-all;
	word-break: break-word;
	hyphens: auto;
}

#adminmenu div.wp-menu-image {
	float: left;
	width: 36px;
	height: 34px;
	margin: 0;
	text-align: center;
}

#adminmenu div.wp-menu-image.svg {
	background-repeat: no-repeat;
	background-position: center;
	background-size: 20px auto;
}

div.wp-menu-image:before {
	color: #a7aaad;
	color: rgba(240, 246, 252, 0.6);
	padding: 7px 0;
	transition: all .1s ease-in-out;
}

#adminmenu div.wp-menu-image:before {
	color: #a7aaad;
	color: rgba(240, 246, 252, 0.6);
}

#adminmenu li.wp-has-current-submenu:hover div.wp-menu-image:before,
#adminmenu .wp-has-current-submenu div.wp-menu-image:before,
#adminmenu .current div.wp-menu-image:before,
#adminmenu a.wp-has-current-submenu:hover div.wp-menu-image:before,
#adminmenu a.current:hover div.wp-menu-image:before,
#adminmenu li.wp-has-current-submenu a:focus div.wp-menu-image:before,
#adminmenu li.wp-has-current-submenu.opensub div.wp-menu-image:before {
	color: #fff;
}

#adminmenu li:hover div.wp-menu-image:before,
#adminmenu li a:focus div.wp-menu-image:before,
#adminmenu li.opensub div.wp-menu-image:before {
	color: #72aee6;
}

.folded #adminmenu div.wp-menu-image {
	width: 35px;
	height: 30px;
	position: absolute;
	z-index: 25;
}

.folded #adminmenu a.menu-top {
	height: 34px;
}

/* Sticky admin menu */
.sticky-menu #adminmenuwrap {
	position: fixed;
}

ul#adminmenu a.wp-has-current-submenu {
	position: relative;
}

ul#adminmenu a.wp-has-current-submenu:after,
ul#adminmenu > li.current > a.current:after {
	right: 0;
	border: solid 8px transparent;
	content: " ";
	height: 0;
	width: 0;
	position: absolute;
	pointer-events: none;
	border-right-color: #f0f0f1;
	top: 50%;
	margin-top: -8px;
}

.folded ul#adminmenu li:hover a.wp-has-current-submenu:after,
.folded ul#adminmenu li.wp-has-current-submenu:focus-within a.wp-has-current-submenu:after {
	display: none;
}

.folded ul#adminmenu a.wp-has-current-submenu:after,
.folded ul#adminmenu > li a.current:after {
	border-width: 4px;
	margin-top: -4px;
}

/* flyout menu arrow */
#adminmenu li.wp-has-submenu.wp-not-current-submenu:hover:after,
#adminmenu li.wp-has-submenu.wp-not-current-submenu:focus-within:after {
	right: 0;
	border: 8px solid transparent;
	content: " ";
	height: 0;
	width: 0;
	position: absolute;
	pointer-events: none;
	top: 10px;
	z-index: 10000;
}

.folded ul#adminmenu li.wp-has-submenu.wp-not-current-submenu:hover:after,
.folded ul#adminmenu li.wp-has-submenu.wp-not-current-submenu:focus-within:after {
	border-width: 4px;
	margin-top: -4px;
	top: 18px;
}

#adminmenu li.wp-has-submenu.wp-not-current-submenu.opensub:hover:after,
#adminmenu li.wp-has-submenu.wp-not-current-submenu:focus-within:after {
	border-right-color: #2c3338;
}

#adminmenu li.menu-top:hover .wp-menu-image img,
#adminmenu li.wp-has-current-submenu .wp-menu-image img {
	opacity: 1;
	filter: alpha(opacity=100);
}

#adminmenu li.wp-menu-separator {
	height: 5px;
	padding: 0;
	margin: 0 0 6px;
	cursor: inherit;
}

/* @todo: is this even needed given that it's nested beneath the above li.wp-menu-separator? */
#adminmenu div.separator {
	height: 2px;
	padding: 0;
}

#adminmenu .wp-submenu .wp-submenu-head {
	color: #fff;
	font-weight: 400;
	font-size: 14px;
	padding: 5px 4px 5px 11px;
	margin: -8px -1px 4px -5px;
	border-width: 3px 1px 3px 5px;
	border-style: solid;
	border-color: transparent;
}

#adminmenu li.current,
.folded #adminmenu li.wp-menu-open {
	border: 0 none;
}

/* @todo: consider to use a single rule for these counters and the list table comments counters. */
#adminmenu .menu-counter,
#adminmenu .awaiting-mod,
#adminmenu .update-plugins {
	display: inline-block;
	vertical-align: top;
	box-sizing: border-box;
	margin: 1px 0 -1px 2px;
	padding: 0 5px;
	min-width: 18px;
	height: 18px;
	border-radius: 9px;
	background-color: #d63638;
	color: #fff;
	font-size: 11px;
	line-height: 1.6;
	text-align: center;
	z-index: 26;
}

#adminmenu li.current a .awaiting-mod,
#adminmenu li a.wp-has-current-submenu .update-plugins {
	background-color: #d63638;
	color: #fff;
}

#adminmenu li span.count-0 {
	display: none;
}

#collapse-button {
	display: block;
	width: 100%;
	height: 34px;
	margin: 0;
	border: none;
	padding: 0;
	position: relative;
	overflow: visible;
	background: none;
	color: #a7aaad;
	cursor: pointer;
}

#collapse-button:hover {
	color: #72aee6;
}

#collapse-button:focus {
	color: #72aee6;
	/* Only visible in Windows High Contrast mode */
	outline: 1px solid transparent;
	outline-offset: -1px;
}

#collapse-button .collapse-button-icon,
#collapse-button .collapse-button-label {
	/* absolutely positioned to avoid 1px shift in IE when button is pressed */
	display: block;
	position: absolute;
	top: 0;
	left: 0;
}

#collapse-button .collapse-button-label {
	top: 8px;
}

#collapse-button .collapse-button-icon {
	width: 36px;
	height: 34px;
}

#collapse-button .collapse-button-label {
	padding: 0 0 0 36px;
}

.folded #collapse-button .collapse-button-label {
	display: none;
}

#collapse-button .collapse-button-icon:after {
	content: "\f148" / '';
	display: block;
	position: relative;
	top: 7px;
	text-align: center;
	font: normal 20px/1 dashicons !important;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}

/* rtl:ignore */
.folded #collapse-button .collapse-button-icon:after,
.rtl #collapse-button .collapse-button-icon:after {
	transform: rotate(180deg);
}

.rtl.folded #collapse-button .collapse-button-icon:after {
	transform: none;
}

#collapse-button .collapse-button-icon:after,
#collapse-button .collapse-button-label {
	transition: all .1s ease-in-out;
}

/**
 * Toolbar menu toggle
 */
li#wp-admin-bar-menu-toggle {
	display: none;
}

/* Hide-if-customize for items we can't add classes to */
.customize-support #menu-appearance a[href="themes.php?page=custom-header"],
.customize-support #menu-appearance a[href="themes.php?page=custom-background"] {
	display: none;
}

/* Auto-folding of the admin menu */
@media only screen and (max-width: 960px) {
	.auto-fold #wpcontent,
	.auto-fold #wpfooter {
		margin-left: 36px;
	}

.auto-fold #adminmenuback,
	.auto-fold #adminmenuwrap,
	.auto-fold #adminmenu,
	.auto-fold #adminmenu li.menu-top {
		width: 36px;
	}

.auto-fold #adminmenu .wp-submenu.sub-open,
	.auto-fold #adminmenu .opensub .wp-submenu,
	.auto-fold #adminmenu .wp-has-current-submenu .wp-submenu.sub-open,
	.auto-fold #adminmenu .wp-has-current-submenu.opensub .wp-submenu,
	.auto-fold #adminmenu a.menu-top:focus + .wp-submenu,
	.auto-fold #adminmenu .wp-has-current-submenu a.menu-top:focus + .wp-submenu {
		top: 0;
		left: 36px;
	}

.auto-fold #adminmenu a.wp-has-current-submenu:focus + .wp-submenu,
	.auto-fold #adminmenu .wp-has-current-submenu .wp-submenu {
		position: absolute;
		top: -1000em;
		margin-right: -1px;
		padding: 6px 0;
		z-index: 9999;
	}

.auto-fold #adminmenu .wp-has-current-submenu .wp-submenu {
		min-width: 160px;
		width: auto;
		border: 1px solid transparent;
		border-left-width: 5px;
	}

.auto-fold #adminmenu .wp-has-current-submenu li > a {
		padding-right: 16px;
		padding-left: 14px;
	}

.auto-fold #adminmenu li.menu-top .wp-submenu > li > a {
		padding-left: 12px;
	}

.auto-fold #adminmenu .wp-menu-name {
		position: absolute;
		left: -999px;
	}

.auto-fold #adminmenu .wp-submenu-head {
		display: block;
	}

.auto-fold #adminmenu div.wp-menu-image {
		height: 30px;
		width: 34px;
		position: absolute;
		z-index: 25;
	}

.auto-fold #adminmenu a.menu-top {
		min-height: 34px;
	}

.auto-fold #adminmenu li.wp-menu-open {
		border: 0 none;
	}

.auto-fold #adminmenu .wp-has-current-submenu.menu-top-last {
		margin-bottom: 0;
	}

.auto-fold ul#adminmenu li:hover a.wp-has-current-submenu:after,
	.auto-fold ul#adminmenu li:focus-within a.wp-has-current-submenu:after {
		display: none;
	}

.auto-fold ul#adminmenu li.wp-has-submenu.wp-not-current-submenu:hover:after,
	.auto-fold ul#adminmenu li.wp-has-submenu.wp-not-current-submenu:focus-within:after {
		border-width: 4px;
		margin-top: -4px;
		top: 16px;
	}

.auto-fold ul#adminmenu a.wp-has-current-submenu:after,
	.auto-fold ul#adminmenu > li a.current:after {
		border-width: 4px;
		margin-top: -4px;
	}

.auto-fold #adminmenu li.menu-top:hover,
	.auto-fold #adminmenu li.opensub > a.menu-top,
	.auto-fold #adminmenu li > a.menu-top:focus {
		z-index: 10000;
	}

.auto-fold #collapse-menu .collapse-button-label {
		display: none;
	}

/* rtl:ignore */
	.auto-fold #collapse-button .collapse-button-icon:after {
		transform: rotate(180deg);
	}

.rtl.auto-fold #collapse-button .collapse-button-icon:after {
		transform: none;
	}

}

@media screen and (max-width: 782px) {
	.auto-fold #wpcontent {
		position: relative;
		margin-left: 0;
		padding-left: 10px;
	}

.sticky-menu #adminmenuwrap {
		position: relative;
		z-index: auto;
		top: 0;
	}

/* Sidebar Adjustments */
	.auto-fold #adminmenu,
	.auto-fold #adminmenuback,
	.auto-fold #adminmenuwrap {
		position: absolute;
		width: 190px;
		z-index: 100;
	}

.auto-fold #adminmenuback {
		position: fixed;
	}

.auto-fold #adminmenuback,
	.auto-fold #adminmenuwrap {
		display: none;
	}

.auto-fold .wp-responsive-open #adminmenuback,
	.auto-fold .wp-responsive-open #adminmenuwrap {
		display: block;
	}

.auto-fold #adminmenu li.menu-top {
		width: 100%;
	}

/* Resize the admin menu items to a comfortable touch size */
	.auto-fold #adminmenu li a {
		font-size: 16px;
		padding: 5px;
	}

.auto-fold #adminmenu li.menu-top .wp-submenu > li > a {
		padding: 10px 10px 10px 20px;
	}

/* Restore the menu names */
	.auto-fold #adminmenu .wp-menu-name {
		position: static;
	}

/* Switch the arrow side */
	.auto-fold ul#adminmenu a.wp-has-current-submenu:after,
	.auto-fold ul#adminmenu > li.current > a.current:after {
		border-width: 8px;
		margin-top: -8px;
	}

.auto-fold ul#adminmenu li.wp-has-submenu.wp-not-current-submenu:hover:after,
	.auto-fold ul#adminmenu li.wp-has-submenu.wp-not-current-submenu:focus-within:after {
		display: none;
	}

/* Make the submenus appear correctly when tapped. */
	#adminmenu .wp-submenu {
		position: relative;
		display: none;
	}

.auto-fold #adminmenu .selected .wp-submenu,
	.auto-fold #adminmenu .wp-menu-open .wp-submenu {
		position: relative;
		display: block;
		top: 0;
		left: -1px;
		box-shadow: none;
	}

.auto-fold #adminmenu .selected .wp-submenu:after,
	.auto-fold #adminmenu .wp-menu-open .wp-submenu:after {
		display: none;
	}

.auto-fold #adminmenu .opensub .wp-submenu {
		display: none;
	}

.auto-fold #adminmenu .selected .wp-submenu {
		display: block;
	}

.auto-fold ul#adminmenu li:hover a.wp-has-current-submenu:after,
	.auto-fold ul#adminmenu li:focus-within a.wp-has-current-submenu:after {
		display: block;
	}

.auto-fold #adminmenu a.menu-top:focus + .wp-submenu,
	.auto-fold #adminmenu .wp-has-current-submenu a.menu-top:focus + .wp-submenu {
		position: relative;
		left: -1px;
		right: 0;
		top: 0;
	}

#adminmenu .wp-not-current-submenu .wp-submenu,
	.folded #adminmenu .wp-has-current-submenu .wp-submenu,
	.auto-fold #adminmenu .wp-has-current-submenu .wp-submenu {
		border: none;
	}

/* Remove submenu headers and adjust sub meu*/
	#adminmenu .wp-submenu .wp-submenu-head {
		display: none;
	}

/* Toolbar menu toggle */
	#wp-responsive-toggle {
		position: fixed;
		top: 5px;
		left: 4px;
		padding-right: 10px;
		z-index: 99999;
		border: none;
		box-sizing: border-box;
	}

#wpadminbar #wp-admin-bar-menu-toggle a {
		display: block;
		padding: 0;
		overflow: hidden;
		outline: none;
		text-decoration: none;
		border: 1px solid transparent;
		background: none;
		height: 44px;
		margin-left: -1px;
	}

.wp-responsive-open #wpadminbar #wp-admin-bar-menu-toggle a {
		background: #2c3338;
	}

li#wp-admin-bar-menu-toggle {
		display: block;
	}

#wpadminbar #wp-admin-bar-menu-toggle a:hover {
		border: 1px solid transparent;
	}

#wpadminbar #wp-admin-bar-menu-toggle .ab-icon:before {
		content: "\f228";
		display: inline-block;
		float: left;
		font: normal 40px/45px dashicons;
		vertical-align: middle;
		outline: none;
		margin: 0;
		-webkit-font-smoothing: antialiased;
		-moz-osx-font-smoothing: grayscale;
		height: 44px;
		width: 50px;
		padding: 0;
		border: none;
		text-align: center;
		text-decoration: none;
		box-sizing: border-box;
	}

.wp-responsive-open #wpadminbar #wp-admin-bar-menu-toggle .ab-icon:before {
		color: #72aee6;
	}
}

/* Smartphone */
@media screen and (max-width: 600px) {
	#adminmenuwrap,
	#adminmenuback {
		display: none;
	}

.wp-responsive-open #adminmenuwrap,
	.wp-responsive-open #adminmenuback {
		display: block;
	}

.auto-fold #adminmenu {
		top: 46px;
	}
}

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