wp-calypso/client/sites/components/site-preview-pane/site-environment-switcher.scss

.site-preview-pane__site-switcher-dropdown-menu {
	.components-popover__content {
		width: 180px;
		padding: calc( 4px * 1 );
	}

	.components-dropdown-menu__menu-item {
		justify-content: flex-start;
	}

	.components-dropdown-menu__menu-item.is-active {
		background-color: var( --color-primary );
		color: var( --color-light-backdrop );
	}

	.components-dropdown-menu__menu-item:focus {
		box-shadow: initial;
	}

	.components-dropdown-menu__menu-item:hover:not( .is-active ) {
		color: var( --color-primary );
	}
}

.site-preview-pane__site-environment-switcher {
	cursor: pointer;
	display: flex;
	align-items: center;
}

.site-preview-pane__site-environment-switcher.components-button.has-icon.has-text {
	gap: 0;
}