If the first item is to be used as a placeholder (empty value) and your select is required
then you can use the :invalid
pseudo-class to target it.
select {
-webkit-appearance: menulist-button;
color: black;
}
select:invalid {
color: green;
}
<select required>
<option value="">Item1</option>
<option value="Item2">Item2</option>
<option value="Item3">Item3</option>
</select>