Documentation

<div class="mb-3">
    <input class="form-control form-control-lg" type="text" placeholder=".form-control-lg" aria-label=".form-control-lg example">
</div>
<div class="mb-3">
    <select class="form-select form-select-lg mb-3" aria-label=".form-select-lg example">
        <option selected="">Open this select menu</option>
        <option value="1">One</option>
        <option value="2">Two</option>
        <option value="3">Three</option>
    </select>
</div>
<div class="mb-3">
    <input type="file" class="form-control form-control-lg" aria-label="Large file input example">
</div>

<div class="mb-3">
    <input class="form-control form-control-sm" type="text" placeholder=".form-control-sm" aria-label=".form-control-sm example">
</div>
<div class="mb-3">
    <select class="form-select form-select-sm" aria-label=".form-select-sm example">
        <option selected="">Open this select menu</option>
        <option value="1">One</option>
        <option value="2">Two</option>
        <option value="3">Three</option>
    </select>
</div>
<div class="mb-3">
    <input type="file" class="form-control form-control-sm" aria-label="Small file input example">
</div>