crea una calculadora cientifica que pueda hacer calculos dificiles en html
<div class="container"> <div class="container__screen"> <div class="container__screen__result"> <span class="container__screen__result__first"></span> <span class="container__screen__result__second"></span> </div> </div> <div class="container__buttons"> <div class="container__buttons__row"> <div class="container__buttons__row__item">MC</div> <div class="container__buttons__row__item">MR</div> <div class="container__buttons__row__item">MS</div> <div class="container__buttons__row__item">M+</div> </div> <div class="container__buttons__row"> <div class="container__buttons__row__item">7</div> <div class="container__buttons__row__item">8</div> <div class="container__buttons__row__item">9</div>