How do I style a form select field, depending on selection with css or jquery?

I want to style the text color in the select field as gray (#b8b8b8), and when a selection (either Yes or NO) is made, the select field text should be styled as white (#fff).

<form>
  <select>
    <option selected disabled>please select</option>
    <option>Yes</option>
    <option>No</option>
  </select>
</form>

I tried all jquery solutions I could find on Stackoverflow, but none of those solutions apply to my needs. I tried using togglefields, but that styles ALL the text in the options, not the select field.

EDIT:
This is the last solution I tried:

function myFunction() {
  document.getElementById("myform").reset();
}

$(document).ready(function() {
  $("#selection").change(toggleFields);
});

function toggleFields() {
  if ($("#selection").val() == "none") {
    $("#selection").css("color", "blue");
  } else {
    $("#selection").css("color", "red");
  }
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>

<form id="myform">
  <select id="selection">
    <option value="none" selected disabled>please select</option>
    <option value="yes">Yes</option>
    <option value="no">No</option>
  </select>
</form>

As you can see, it styles the "yes" and "no" options as red, but it doesn't style the "please select" option as blue. I also tried to target the disabled option directly with css, but that only changed the dropdown <option> styling when the list is open (dropped down), not the styling when the dropdown is initially closed upon loading of the page.

Solution

**Solution **

<style>
    select {
      color: #b8b8b8;
      background-color: #333; /* Optional: Set a background color for better contrast */
    }
    select.valid {
      color: #fff;
    }
  </style>
  <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
</head>
<body>
  <form>
    <select id="mySelect">
      <option selected disabled>please select</option>
      <option>Yes</option>
      <option>No</option>
    </select>
  </form>

  <script>
    $(document).ready(function() {
      $('#mySelect').on('change', function() {
        if ($(this).val() !== 'please select') {
          $(this).addClass('valid');
        } else {
          $(this).removeClass('valid');
        }
      });
    });
  </script>
</body>