title: How to remove the blue highlight of button on mobile?
body: <p>I try to remove the blue box that appears on click in front of buttons as you can see below:
  <img src="https://i.stack.imgur.com/7y46f.png" alt="My button" /></p>
  <p>Before asking, I have made a lot of research, I have tried the solutions given by the following topics:</p>
  <ul>
  <li><a href="https://stackoverflow.com/questions/3397113/how-to-remove-border-outline-around-text-input-boxes-chrome">How to remove focus border (outline) around text/input boxes? (Chrome)</a></li>
  <li><a href="https://stackoverflow.com/questions/22746464/remove-blue-box-around-buttons-html">Remove blue box around buttons. HTML</a></li>
  <li><a href="https://stackoverflow.com/questions/24222798/how-to-remove-the-blue-box-shadow-border-in-button-if-clicked">How to remove the blue box shadow border in button if clicked</a></li>
  <li><a href="https://stackoverflow.com/questions/20593224/remove-blue-selected-outline-on-buttons/43773106#43773106">How do I remove blue &quot;selected&quot; outline on buttons?</a></li>
  <li><a href="https://stackoverflow.com/questions/20593224/remove-blue-selected-outline-on-buttons">How do I remove blue &quot;selected&quot; outline on buttons?</a></li>
  <li><a href="https://stackoverflow.com/questions/20340138/remove-blue-border-from-css-custom-styled-button-in-chrome">Remove blue border from css custom-styled button in Chrome</a></li>
  <li><a href="https://stackoverflow.com/questions/19053181/how-to-remove-focus-around-buttons-on-click">How to remove focus around buttons on click</a></li>
  </ul>
  <p>I have tried all the answers! It works on computer but not on mobile.</p>
  <p>If you are using a computer, you can try by simulating mobile with the inspector. Here is the button: <a href="https://jsfiddle.net/t4ykshst/" rel="noreferrer">https://jsfiddle.net/t4ykshst/</a></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-css lang-css prettyprint-override"><code>#add {
      -webkit-box-sizing: content-box;
      -moz-box-sizing: content-box;
      box-sizing: content-box;
      outline: none;
      cursor: pointer;
      padding: 10px;
      overflow: hidden;
      border: none;
      -webkit-border-radius: 50%;
      border-radius: 50%;
      color: rgba(255, 255, 255, 0.9);
      text-align: center;
      background: #1abc9c;
      -webkit-box-shadow: 0 4px 3px 2px rgba(0, 0, 0, 0.2);
      box-shadow: 0 4px 3px 2px rgba(0, 0, 0, 0.2);
  }
  
  #add:active {
      opacity: 0.85;
      -webkit-box-shadow: 2px 2px 2px 0 rgba(0, 0, 0, 0.2);
      box-shadow: 2px 2px 2px 0 rgba(0, 0, 0, 0.2);
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;input type="button" id="add" value="+" title="" style="position: absolute; left: 0px; top: 0px; width: 52px; height: 52px;" /&gt;</code></pre>
  </div>
  </div>
  </p>