IMO A Better WordPress Admin (Minimal CSS Tweaks For A More Minimal Dashboard)

gistfile1.txt

/* Change font (most of admin) */
.wp-admin {
	font-family: 'Courier New',Courier,monospace;
        text-rendering: optimizeLegibility;
}

/* Change font (top bar) */
#wpadminbar * {
	font-family: 'Courier New',Courier,monospace!important;
	text-rendering: optimizeLegibility;
}

/* Remove top bar icons */
#wpadminbar .ab-icon:before,#wpadminbar #wp-admin-bar-seopress .svg.seopress-logo,.wp-admin #wpadminbar #wp-admin-bar-site-name>.ab-item:before {
	display: none;
}

/* Adjust site name left margin */
.wp-admin #wpadminbar #wp-admin-bar-site-name {
	margin-left: 10px;
}

/* Remove menu icons and clean up side menu */
.wp-menu-image {
	display: none;
}

.wp-menu-name {
	margin-left: 10px;
}

#adminmenu div.wp-menu-name {
	padding-left: 10px!important;
}

/* Change the admin top bar background color */
#wpadminbar {
	background-color: #000!important;
}

/* Change the admin side menu background color */
#adminmenu,#adminmenu .wp-submenu,#adminmenuback,#adminmenuwrap {
	background-color: #000!important;
}

/* A little extra spacing needed before pagination on some pages */
.tablenav .tablenav-pages {
	margin: 10px 0!important;
}

/* Toggle icons */
.toggle-indicator,.postbox .handlediv .toggle-indicator::before {
	color: #000000;
}

Added the following because the arrow/toggle indicators weren't showing.

/* Toggle icons */
.toggle-indicator,.postbox .handlediv .toggle-indicator::before {
color: #000000;
}