Reply To: [Waiting for user confirmation] can not edit Field group HTML of Styling Editor

I see, but
How can I add css to a specific option among many options ?
—————————————————————————————
<select name="blood">
<option value="select">please select your type</option>
<option value="A">A</option>
<option value="B">B</option>
<option value="O">O</option>
<option value="AB">AB</option>
</select>
———————————————————————————————
I want to add "disable" on below option
<option value="select">please select your type</option>

Many people need to do this, I think.

please show me some way or hint ?
need to add some coding inside function.php?

thank you