bootstrap issue

thing.html

<div class="row row-cols-1 row-cols-md-2">
    <div class="col-12 col-md-8 m-15px-tb">
        <div class="contact-name name-text">
            <h5>Gegevens van de2av</h5>
            <br>
            <form method="POST">
                <label class="fw-bold" for="email">E-mailadres</label>
                <input type="email" id="email" readonly="" class="changeFormControl form-control-plaintext" name="email"
                    placeholder="Email" value="example@example.com" required="">

                <label class="fw-bold" for="address1">Adres</label>
                <input type="text" id="address" readonly="" class="changeFormControl form-control-plaintext"
                    name="address1" placeholder="Adres" value="Amsterdam 8" maxlength="20" required="">
                <label class="fw-bold" for="address2">Adresregel 2</label>
                <input type="text" id="address" readonly="" class="changeFormControl form-control-plaintext"
                    name="address2" placeholder="Adresregel 2" value="">

                <label class="fw-bold" for="postcode">Postcode</label>
                <input type="text" id="postcode" readonly="" class="changeFormControl form-control-plaintext"
                    name="postcode" placeholder="Postcode" value="1020" maxlength="7" required="">

                <label class="fw-bold" for="plaats">Plaats</label>
                <input type="text" id="city" readonly="" class="changeFormControl form-control-plaintext" name="plaats"
                    placeholder="Plaats" value="Nijmegen" required="">

                <label class="fw-bold" for="land">Land</label>
                <input type="text" id="address" readonly="" class="changeFormControl form-control-plaintext" name="land"
                    placeholder="Land" value="Nederland" required="">

                <label class="fw-bold" for="phonenmbr">Telefoonnummer</label>
                <input type="tel" id="phonenmbr" readonly="" class="changeFormControl form-control-plaintext"
                    name="phonenmbr" placeholder="Telefoonnummer" value="0612345678" pattern="[0-9]{10}">
                <label class="fw-bold" for="iban">IBAN</label><input type="password" id="iban" readonly=""
                    class="changeFormControl form-control-plaintext" name="iban" placeholder="IBAN"
                    value="NL12ABNA345678911">
                <p><a href="javascript:showIban()" class="link">IBAN tonen</a></p><br><label class="fw-bold"
                    for="creditcard">Creditcardnummer</label><input type="password" id="creditcard" readonly=""
                    class="changeFormControl form-control-plaintext" name="creditcard" placeholder="Creditcard"
                    value="1111111111111">
                <p><a href="javascript:showCreditCard()" class="link">Creditcardnummer tonen</a></p><input type="submit"
                    name="submitBtn" value="Bevestigen" class="btn btn-primary mt-2 pl-2 d-none" id="changeDetailsBtn">

            </form>
        </div>
    </div>
    <div class="col-12 col-md-4 me-md-3 col-force-right">
        <h3 class="text-primary">Mijn veilingen</h3>
        <div class="row gx-4 row-cols-1 row-cols-md-2 d-flex">
            <div class="col mb-5">
                <div class="card card-auction h-100"><a href="http://localhost/auction?id=150975431321"><img
                            class="card-img-top" src="http://localhost/uploads/dt_1_150975431321.jpg"
                            alt="veilingsfoto"></a>
                    <div class="card-body p-2 pt-4 pb-0">
                        <div class="text-center">
                            <h5 class="fw-bolder">CADRE PHOTO CHEVAL EN RESINE 2...</h5>vanaf € 5,00<br><span
                                class="countdownclock" data-time="607214">over 7d 0u 40m 14s</span>
                        </div>
                    </div>
                    <div class="card-footer p-4 pt-0 border-top-0 bg-transparent">
                        <div class="text-center"><a class="btn-primary btn mt-2"
                                href="http://localhost/auction?id=150975431321">Bekijk veiling</a></div>
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>