text: const char indexpage[] = R"=====(
  <!DOCTYPE html>
  <html lang="en">
  
  <head>
      <meta charset="UTF-8">
      <meta http-equiv="X-UA-Compatible" content="IE=edge">
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <title>Button Basher</title>
  </head>
  
  <body>
      <div class="content">
          <h2>Button Basher</h2><br>
          <button onclick="trigger()">Toggle</button>
      </div>
  </body>
  <script>
      function trigger() {
          fetch('/t')
              .then(response => response.json())
              .then(data => console.log(data));
      }
  </script>
  <style>
      body {
          background-color: aqua;
          color: black;
          display: flex;
          align-items: center;
          justify-content: center;
      }
  </style>
  
  </html>
  )=====";