Why is the autofill text color not white in my form input?

input:-webkit-autofill {
  background-color: #000 !important;
  color: #fff !important;
  -webkit-box-shadow: 0 0 0 1000px #000 inset !important;
  box-shadow: 0 0 0px 1000px #000 inset !important;
  transition: background-color 5000s ease-in-out 0s;
}

<form action="/submit-form" method="post">
        <label for="name">Name:</label>
        <input type="text" id="name" name="name" placeholder="Enter your name" required>
        <button type="submit">Submit</button>
    </form>