wp-calypso/client/lib/auth-helper/style.scss

.auth-helper__popover {
	display: none;
}

.environment.is-auth:hover .auth-helper__popover {
	display: block;
	position: absolute;
	bottom: 100%;
	padding: 4px;
	background: var(--color-surface);
	box-shadow: 0 0 0 1px var(--color-border-subtle);
}

.auth-helper__label {
	display: block;
	margin-bottom: 4px;
	line-height: 16px;

	input[type="radio"] {
		appearance: auto;
		vertical-align: middle;
		margin: 0 4px 0 0;
	}
}