<meta name="refresh-rate" content="500" />
  
  <div class="header">
    <h1>Voltage measurement</h1>
  </div>

  <div class="content">
    <p id="voltage" align="center" style="font-size: 800%"/>

    <table class="pure-table pure-table-bordered" align="center" id="table"/>
  </div>
  
</body></html>