<select class="form-select mb-4" id="form-select-01" name="form-select-01" aria-label="Default select example">
    <option selected>Open this select menu</option>
    <option value="1">One</option>
    <option value="2">Two</option>
    <option value="3">Three</option>
</select>

<select class="form-select" id="form-select-02" name="form-select-02" aria-label="Disabled select example" disabled>
    <option selected>Open this select menu</option>
    <option value="1">One</option>
    <option value="2">Two</option>
    <option value="3">Three</option>
</select>

<select class="form-select form-select-lg mb-4" id="form-select-03" name="form-select-03" aria-label="Large select example">
    <option selected>Open this select menu</option>
    <option value="1">One</option>
    <option value="2">Two</option>
    <option value="3">Three</option>
</select>

<select class="form-select form-select-sm" id="form-select-04" name="form-select-04" aria-label="Small select example">
    <option selected>Open this select menu</option>
    <option value="1">One</option>
    <option value="2">Two</option>
    <option value="3">Three</option>
</select>