Supprimer et restaurer un élément du DOM avec des effets de fondu

J'essaie de créer un modal personnalisé, ce qui fonctionne bien car ce que je veux obtenir, c'est de cliquer sur X qui supprime complètement l'élément du DOM, je veux pas cacher l'élément dans le DOM, puis de cliquer sur ajouter pour le restaurer, mais je veux maintenant ajouter des effets de fondu et de fondu lors de la restauration et de la fermeture ou suppression du modal, ajouté à cela, le modal s'affiche déjà lors du chargement de la page, je souhaite qu'il ne s'affiche que lorsque vous cliquez sur le bouton "add". Quelqu'un peut-il m'aider s'il vous plaît, je suis un apprenant et un débutant ainsi, s'il vous plaît.
J'ai un exemple de ce que je veux sur http://jsfiddle.net/dLdFZ/16/

JS

Code:

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$(document).ready(function() {
  var toBeDeleted = $('.modal-backdrop');
  $('.blu-modal__close').on('click', function(event) {
    event.preventDefault();
    $(toBeDeleted).detach();
  });
  $('#buttonAdd').on('click', function(event) {
    event.preventDefault();
    if ($('body').find('.modal-backdrop').length == 0) {
      $('body').append(toBeDeleted);
    }
  });
});

Code:

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.modal-backdrop {
  z-index: 4000;
}
 
.blu-modal__container {
  -webkit-transition: opacity .3s ease;
  transition: opacity .3s ease;
  width: 90%;
  max-width: 500px;
  height: auto;
  background: #fff;
  position: fixed;
  z-index: 1000;
}
 
@media screen and (min-width: 769px),
print {
  .blu-modal__container {
    top: 50%;
    left: 50%;
    -webkit-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
  }
}
 
.blu-modal.b-page .blu-modal__container {
  max-height: calc(100% - 50px);
  padding-top: 16px;
}
 
@media screen and (min-width: 769px),
print {
  .blu-modal.b-page .blu-modal__container {
    border-radius: 16px;
  }
}
 
.blu-modal.b-page .blu-modal__container {
  width: 480px;
}
 
.b-page .blu-modal__close {
  position: absolute;
  top: -20px;
  right: 20px;
}
 
.b-page .blu-modal__close i:before,
.b-page .blu-modal__close i:after {
  content: '';
  width: 20px;
  height: 4px;
  border-radius: 4px;
  background-color: #f1f1f1;
  position: absolute;
}
 
.b-page .blu-modal__close i:before {
  -webkit-transform: rotate(45deg);
  transform: rotate(45deg);
}
 
.b-page .blu-modal__close i:after {
  -webkit-transform: rotate(-45deg);
  transform: rotate(-45deg);
}
 
@media screen and (min-width: 769px),
print {
  .blu-modal.b-page .blu-modal__header {
    padding: 0 32px;
  }
}
 
.blu-modal__heading {
  font-family: "efframedium", Helvetica, Arial, sans-serif;
  margin-bottom: 10px;
}
 
.modal-backdrop .modal__header {
  display: -ms-flexbox;
  display: flex;
}
 
.modal-backdrop .modal__header__image {
  margin-right: 20px;
  width: 100px;
  height: 100px;
  border-radius: 10px;
  background-color: #ffffff;
}
 
.modal-backdrop .modal__header__image img {
  max-height: 100px;
  min-width: 100px;
}
 
.modal-backdrop .modal__header__name-attr {
  -ms-flex-direction: column;
  flex-direction: column;
  margin: auto 0;
}
 
.modal-backdrop .modal__header__name-attr__attribute {
  font-size: 1.4rem;
  font-weight: 500;
  color: #BDBDBD;
}
 
.blu-modal__body {
  overflow-x: auto;
  color: rgba(0, 0, 0, 0.6);
}
 
@media screen and (min-width: 769px),
print {
  .blu-modal__body {
    max-height: calc(100vh - 230px);
  }
}
 
.blu-modal.b-page .blu-modal__body {
  color: rgba(0, 0, 0, 0.6);
}
 
@media screen and (min-width: 769px),
print {
  .blu-modal.b-page .blu-modal__body {
    padding: 0 32px;
  }
}
 
.modal-backdrop .modal__body {
  display: -ms-flexbox;
  display: flex;
  -ms-flex-direction: column;
  flex-direction: column;
  padding-top: 10px;
}
 
.modal-backdrop .modal__body__detail {
  margin-bottom: 15px;
}
 
.attributes__section {
  width: 100%;
  margin-bottom: 5px;
}
 
.attributes--label-with-value {
  display: -ms-flexbox;
  display: flex;
}
 
.attributes--label {
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
  color: rgba(0, 0, 0, 0.48);
  font-size: 16px;
  font-weight: bold;
  vertical-align: top;
  line-height: normal;
}
 
.attributes--value {
  overflow: scroll;
  vertical-align: top;
  font-size: 16px;
  padding: 6px;
  color: #0095da;
}
 
.b-flex {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
}
 
@media only screen and (min-width: 63.75em) {
  .product-variant__color__thumb__wrapper {
    overflow: auto;
  }
}
 
.product-variant__color__thumb {
  cursor: pointer;
  margin: 2px;
  display: -ms-inline-flexbox;
  display: inline-flex;
}
 
@media only screen and (min-width: 63.75em) {
  <style>.product-variant__color__thumb {
    min-width: 60px;
    margin: 8px;
    display: -ms-inline-grid;
    display: inline-grid;
  }
}
 
.product-variant__image {
  background-color: #fff;
  border: 2px solid #E0E0E0;
  border-radius: 8px;
}
 
@media only screen and (min-width: 63.75em) {
  .product-variant__image {
    overflow: auto;
    width: 60px;
    height: 60px;
  }
}
 
.product-variant__image__selected {
  border-color: #41C3FF;
}
 
.modal-backdrop .modal__body__price-qty {
  display: -ms-flexbox;
  display: flex;
  margin-bottom: 15px;
}
 
.modal-backdrop .modal__body__price-qty__price__display {
  font-size: 20px;
  font-weight: 600;
  font-style: normal;
  font-stretch: normal;
  line-height: normal;
  letter-spacing: normal;
  color: #f37021;
}
 
.modal-backdrop .modal__body__price-qty__price__display__list {
  color: rgba(0, 0, 0, 0.48);
  font-size: 15px;
  text-decoration: line-through;
}
 
.modal-backdrop .modal__body__price-qty__quantity {
  display: -ms-flexbox;
  display: flex;
  margin-left: auto;
}
 
.blu-modal__footer {
  text-align: right;
}
 
@media screen and (min-width: 769px),
print {
  .blu-modal.b-page .blu-modal__footer {
    padding: 16px 32px;
  }
}
 
.blu-modal__mask {
  -webkit-transition: opacity .3s ease;
  transition: opacity .3s ease;
  position: fixed;
  z-index: 999;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.64);
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -ms-flex-direction: column;
  flex-direction: column;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  justify-content: center;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
}

Code:

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<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
 
<body>
 
  <button type="button" class="" id="buttonAdd">Add</button>
 
  <div class="blu-modal modal-backdrop b-page">
    <div class="blu-modal__container">
      <button class="blu-modal__close">
            <i></i>
        </button>
      <div class="blu-modal__header">
        <div class="blu-modal__icon"></div>
        <h3 class="blu-modal__heading">
          <div class="modal__header">
            <div class="modal__header__image">
              <img src="https://www.static-src.com/wcsstore/Indraprastha/images/catalog/full//90/MTA-11741139/apple_iphone_12_mini_128gb_resmi_full05_mz4v26r0.jpg?output-format=webp" data-src="https://www.static-src.com/wcsstore/Indraprastha/images/catalog/full//90/MTA-11741139/apple_iphone_12_mini_128gb_resmi_full05_mz4v26r0.jpg?output-format=webp"
                alt="iPhone 12 Mini 128GB Resmi" class="lazyImage" draggable="false" data-loaded="true">
            </div>
            <div class="modal__header__name-attr">
              <div class="modal__header__name-attr__name"> iPhone 12 Mini 128GB Resmi </div>
              <div class="modal__header__name-attr__attribute"> Red </div>
            </div>
          </div>
        </h3>
      </div>
      <div class="blu-modal__body">
        <div class="modal__body">
          <div class="modal__body__detail">
            <div class="modal__body__detail__attribute">
              <div>
                <!---->
              </div>
              <div>
                <div id="attributes">
                  <div>
                    <div class="attributes__section">
                      <div class="attributes--label-with-value">
                        <div class="attributes--label">Warna</div>
                        <div class="attributes--label"> : Red </div>
                        <!---->
                      </div>
                      <div class="attributes--value">
                        <div>
                          <div class="product-variant__color__thumb__wrapper b-flex">
                            <figure class="product-variant__color__thumb">
                              <img src="https://www.static-src.com/wcsstore/Indraprastha/images/catalog/thumbnail//90/MTA-11741139/apple_iphone_12_mini_128gb_resmi_full06_s5xmq8zt.jpg" alt="White" class="product-variant__image">
                            </figure>
                            <figure class="product-variant__color__thumb">
                              <img src="https://www.static-src.com/wcsstore/Indraprastha/images/catalog/thumbnail//90/MTA-11741139/apple_iphone_12_mini_128gb_resmi_full05_mz4v26r0.jpg" alt="Red" class="product-variant__image product-variant__image__selected">
                            </figure>
                            <figure class="product-variant__color__thumb">
                              <img src="https://www.static-src.com/wcsstore/Indraprastha/images/catalog/thumbnail//90/MTA-11741139/apple_iphone_12_mini_128gb_resmi_full03_tdkcqg4k.jpg" alt="Green" class="product-variant__image">
                            </figure>
                            <figure class="product-variant__color__thumb">
                              <img src="https://www.static-src.com/wcsstore/Indraprastha/images/catalog/thumbnail//90/MTA-11741139/apple_iphone_12_mini_128gb_resmi_full02_ftornd3v.jpg" alt="Blue" class="product-variant__image">
                            </figure>
                            <figure class="product-variant__color__thumb">
                              <img src="https://www.static-src.com/wcsstore/Indraprastha/images/catalog/thumbnail//90/MTA-11741139/apple_iphone_12_mini_128gb_resmi_full01_ee17vwzj.jpg" alt="Black" class="product-variant__image">
                            </figure>
                          </div>
                          <div></div>
                        </div>
                      </div>
                    </div>
                  </div>
                </div>
              </div>
            </div>
            <hr>
          </div>
          <div 2f0="" class="modal__body__price-qty">
            <div class="modal__body__price-qty__price">
              <div>
                <strong class="modal__body__price-qty__price__display"> Rp11.548.000 </strong>
              </div>
              <div>
                <strong class="modal__body__price-qty__price__display__list"> Rp16.999.000 </strong>
              </div>
            </div>
            <div class="modal__body__price-qty__quantity">
              <button type="button" class="quantity-input-btn qtyminus btn-number input-box" field="quantity" data-id="1696">
                            <span class="fa fa-minus"></span>
                        </button>
              <input type="number" min="1" class="quantity-input-value input-box" id="qty_1697" value="1">
              <button type="button" class="quantity-input-btn qtyplus btn-number input-box" field="quantity" data-id="1696">
                            <span class="fa fa-plus"></span>
                        </button>
            </div>
          </div>
          <div class="modal__body__add-to-cart">
            <button type="button" class="blu-btn modal__body__add-to-cart__button b-full-width b-secondary">
                        <div class="blu-ripple">Tambah ke Bag </div>
                    </button>
          </div>
        </div>
      </div>
      <div class="blu-modal__footer"></div>
    </div>
    <div class="blu-modal__mask"></div>
  </div>
</body>