Fieldset

    <fieldset class="box">
        <legend>Page title</legend>

        <div class="field">
            <label class="label" for="card-name">Card Number</label>
            <input
                id="card-name"
                class="input"
                type="text"
                placeholder="1234 1234 1234 1234"
            />
            <p class="help">Enter your 16-digit number.</p>
        </div>
    </fieldset>