<form>
    <p>Click on the text box and choose any option suggested by your browser.</p>

    <label for="name">Name</label>
    <input name="name" type="text" autocomplete="name">

    <label for="email">Email Address</label>
    <input name="email" type="email" autocomplete="email">

    <label for="country">Country</label>
    <input name="country" type="text" autocomplete="country-name">
</form>

label {
    display: block;
    margin-top: 1em;
}

input:autofill {
    border: 3px solid darkorange;
}

input:-webkit-autofill {
    border: 3px solid darkorange;
}