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>