/* INPUT DATE*/
#billing_date_of_birth { 
  font: 1.2em sans-serif;
  padding: 0.5em 1em;
}

input::placeholder,
select.show-placeholder,
select option:first-child {
	color: #999;
}

select.show-placeholder option {
		color: #000;
}

/* Display the dropdowns next to each other */
#date-select-wrapper {
  display: flex;
  max-width: 300px; /* just for this demo */
}

#date-select-wrapper > * {
		flex-grow: 1;
		width: auto;
		margin: 0;
}