title: how to create multiple button for modal popup in css
body: <p>I have this script from this source <a href="https://www.w3schools.com/howto/tryit.asp?filename=tryhow_css_modal2" rel="nofollow noreferrer">https://www.w3schools.com/howto/tryit.asp?filename=tryhow_css_modal2</a>. its working fine and thus popup modal when the button click. Now i want add more two buttons so that when one click on any of the button eg. button 1,button 2 and 3. it will popup modal. how can I achieve that.</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>// Get the modal
  var modal = document.getElementById('myModal');
  
  // Get the button that opens the modal
  var btn = document.getElementById("myBtn");
  
  // Get the &lt;span&gt; element that closes the modal
  var span = document.getElementsByClassName("close")[0];
  
  // When the user clicks the button, open the modal 
  btn.onclick = function() {
    modal.style.display = "block";
  }
  
  // When the user clicks on &lt;span&gt; (x), close the modal
  span.onclick = function() {
    modal.style.display = "none";
  }
  
  // When the user clicks anywhere outside of the modal, close it
  window.onclick = function(event) {
    if (event.target == modal) {
      modal.style.display = "none";
    }
  }</code></pre>
  <pre class="snippet-code-css lang-css prettyprint-override"><code>body {
    font-family: Arial, Helvetica, sans-serif;
  }
  
  
  /* The Modal (background) */
  
  .modal {
    display: none;
    /* Hidden by default */
    position: fixed;
    /* Stay in place */
    z-index: 1;
    /* Sit on top */
    padding-top: 100px;
    /* Location of the box */
    left: 0;
    top: 0;
    width: 100%;
    /* Full width */
    height: 100%;
    /* Full height */
    overflow: auto;
    /* Enable scroll if needed */
    background-color: rgb(0, 0, 0);
    /* Fallback color */
    background-color: rgba(0, 0, 0, 0.4);
    /* Black w/ opacity */
  }
  
  
  /* Modal Content */
  
  .modal-content {
    position: relative;
    background-color: #fefefe;
    margin: auto;
    padding: 0;
    border: 1px solid #888;
    width: 80%;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
    -webkit-animation-name: animatetop;
    -webkit-animation-duration: 0.4s;
    animation-name: animatetop;
    animation-duration: 0.4s
  }
  
  
  /* Add Animation */
  
  @-webkit-keyframes animatetop {
    from {
      top: -300px;
      opacity: 0
    }
    to {
      top: 0;
      opacity: 1
    }
  }
  
  @keyframes animatetop {
    from {
      top: -300px;
      opacity: 0
    }
    to {
      top: 0;
      opacity: 1
    }
  }
  
  
  /* The Close Button */
  
  .close {
    color: white;
    float: right;
    font-size: 28px;
    font-weight: bold;
  }
  
  .close:hover,
  .close:focus {
    color: #000;
    text-decoration: none;
    cursor: pointer;
  }
  
  .modal-header {
    padding: 2px 16px;
    background-color: #5cb85c;
    color: white;
    height: 10%;
  }
  
  .modal-body {
    padding: 2px 16px;
  }
  
  .modal-footer {
    padding: 2px 16px;
    background-color: #5cb85c;
    color: white;
    postion: fixed;
    height: 15%;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;h2&gt;Animated Modal with Header and Footer&lt;/h2&gt;
  
  &lt;!-- Trigger/Open The Modal --&gt;
  &lt;button id="myBtn"&gt;butoon 1&lt;/button&gt;
  &lt;button id="myBtn"&gt;button 2&lt;/button&gt;
  &lt;button id="myBtn"&gt;button 3&lt;/button&gt;
  
  &lt;!-- The Modal --&gt;
  &lt;div id="myModal" class="modal"&gt;
  
    &lt;!-- Modal content --&gt;
    &lt;div style="width:100%;height:100vh;margin-top:-100px" class="modal-content"&gt;
      &lt;div class="modal-header"&gt;
        &lt;span class="close"&gt;&amp;times;&lt;/span&gt;
        &lt;h2&gt;Modal Header&lt;/h2&gt;
      &lt;/div&gt;
      &lt;div class="modal-body"&gt;
        &lt;p&gt;chat messages goes here&lt;/p&gt;&lt;br&gt;
        &lt;p&gt;chat messages goes here&lt;/p&gt;
        &lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;
        &lt;p&gt;chat messages goes here&lt;/p&gt;
        &lt;p&gt;chat messages goes here&lt;/p&gt;
        &lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;
      &lt;/div&gt;
      &lt;div style="" class="modal-footer"&gt;
        Chat: &lt;input type="text" placeholder="Chat Message" class="form-control"&gt;
        &lt;div&gt;Files Goes Here&lt;/div&gt;
      &lt;/div&gt;
    &lt;/div&gt;
  
  &lt;/div&gt;</code></pre>
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  </p>