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HTML

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CSS

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CSS Base

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JavaScript

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HTML 

              
                <h1>Dialog Element</h1>

<button class="open-modeless open-button">show()</button>
<button class="open-modal open-button">showModal()</button>

<!-- モードレスダイアログ -->
<dialog class="modeless">
  <!-- ダイアログヘッダー -->
  <div class="dialog-header">
    <p>Modeless Dialog</p>
    <button class="close-modeless close-button">&times;</button>
  </div>
  <!-- ダイアログコンテンツ -->
  <h2 class="title">Welcome to Pyxofy</h2>
  <p class="message">Empower Digital Natives thru Education and Technology</p>
</dialog>

<!-- モーダルダイアログ -->
<dialog class="modal">
  <!-- ダイアログヘッダー -->
  <div class="dialog-header">
    <p>Modal Dialog</p>
    <button class="close-modal close-button">&times;</button>
  </div>
  <!-- ダイアログコンテンツ -->
  <h2 class="title">Welcome to Pyxofy</h2>
  <p class="message">Empower Digital Natives thru Education and Technology</p>
</dialog>
!

CSS 

              
                body {
  text-align: center;
  font-family: Arial, Helvetica, sans-serif;
}

/* ダイアログを開くボタン */
.open-button {
  margin: 10px;
  width: 200px;
  height: 50px;
  font-size: 20px;
  font-weight: bold;
  border: none;
  border-radius: 10px;
  background-color: #fcc891;
  cursor: pointer;
}

.open-button:hover {
  color: #ffffff;
  background-color: #ed7e07;
  box-shadow: 0 5px 5px #cccccc;
}

/* ダイアログ */
.modeless,
.modal {
  width: 70%;
  max-width: 500px;
  padding: 0;
  border: none;
  box-shadow: #595959 2px 2px 5px 2px;
}

/* モーダルダイアログの背後 */
.modal::backdrop {
  background-color: #12121290;
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px); /* Safari */
}

/* ダイアログヘッダー */
.dialog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 50px;
  padding: 0 10px 0 10px;
  margin-bottom: 30px;
  color: #ffffff;
  background-color: #0d7df5;
}

.dialog-header p {
  font-size: 15px;
}

/* ダイアログを閉じるボタン */
.close-button {
  width: 40px;
  height: 40px;
  font-size: 15px;
  font-weight: bold;
  margin-left: auto;
  background-color: #e6e6e6;
  cursor: pointer;
  border: none;
  border-radius: 20px;
}

.close-button:hover {
  color: #ffffff;
  font-weight: bold;
  background-color: #ed7e07;
}

.title {
  font-size: 30pxe;
  margin: 20px;
}

.message {
  font-size: 18px;
  margin: 30px 20px;
}
!

JS 

              
                //ダイアログを開くボタン
const openModeless = document.querySelector(".open-modeless");
const openModal = document.querySelector(".open-modal");
//ダイアログ
const modeless = document.querySelector(".modeless");
const modal = document.querySelector(".modal");
//閉じるボタン
const closeModeless = document.querySelector("button.close-modeless");
const closeModal = document.querySelector("button.close-modal");

//モードレスダイアログを開く
openModeless.addEventListener("click", () => {
  modeless.show();
});
//モーダルダイアログを開く
openModal.addEventListener("click", () => {
  modal.showModal();
});

//モードレスダイアログを閉じる
closeModeless.addEventListener("click", () => {
  modeless.close();
});
//モーダルダイアログを閉じる
closeModal.addEventListener("click", () => {
  modal.close();
});
!
999px

Console