When dialing a number, it is desirable to highlight the pressed button.
When clicking on any button in the index.html file, the pressed class must be added to it for 500ms.
This class should change the background-color property to #D5CFE1.
After 500ms, the class must be removed for the color to return to its original position.
Use internal styles and script.

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      body {
        display: grid;
        height: 100vh;
        place-items: center;;
      .container {
        display: grid;
        grid-template-columns: repeat(3, 100px);
        grid-template-rows: repeat(4, 100px);
        gap: 8px;
      .button {
        background-color: #EDDFEF;
        color: #464655;
        font-size: 36px;
        line-height: 100px;
        text-align: center;
        font-family: monospace;
        cursor: pointer;
      .button:last-child {
        grid-column: 2 / span 1;
    <div class="container">
      <div class="button">1</div>
      <div class="button">2</div>
      <div class="button">3</div>
      <div class="button">4</div>
      <div class="button">5</div>
      <div class="button">6</div>
      <div class="button">7</div>
      <div class="button">8</div>
      <div class="button">9</div>
      <div class="button">0</div>