<label for="recipients">Where should we send the receipt?</label>
<input name="recipients" type="email" multiple>

<label for="shakes">Which shakes would you like to order?</label>
<select name="shakes" multiple>
    <option>Vanilla Shake</option>
    <option>Strawberry Shake</option>
    <option>Chocolate Shake</option>
</select>

<label for="payment">How would you like to pay?</label>
<select name="payment">
    <option>Credit card</option>
    <option>Bank Transfer</option>
</select>

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

input,
select {
    width: 100%;
}

input:invalid {
    background-color: lightpink;
}