Overleaf/services/web/public/stylesheets/app/editor/online-users.less

@online-user-color: rgb(0, 170, 255);

.online-users {
	.online-user {
		background-color: @online-user-color;
		width: 24px;
		display: inline-block;
		height: 24px;
		margin-right: 8px;
		text-align: center;
		color: white;
		text-transform: uppercase;
		border-radius: 3px;
		cursor: pointer;
	}
	
	.online-user-multi {
		width: auto;
		min-width: 24px;
		padding-left: 8px;
		padding-right: 5px;
	}
	
	.dropdown-menu {
		a {
			// Override toolbar link styles
			display: block;
			padding: 4px 10px 5px;
			margin: 1px 2px;
			color: @text-color;
			&:hover, &:active {
				color: @text-color;
				background-color: @gray-lightest;
				text-shadow: none;
				.box-shadow(none);
			}
		}
	}
}