<style>
body {
  font-family: Arial, Helvetica, sans-serif;
}

.mobile-container {
  max-width: 480px;
  margin: auto;
  background-color: #555;
  height: 500px;
  color: white;
  border-radius: 10px;
}

.topnav {
  overflow: hidden;
  background-color: #333;
  position: relative;
}

.topnav #myLinks {
  display: none;
}

.topnav a {
  color: white;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 17px;
  display: block;
}

.topnav a.icon {
  background: black;
  display: block;
  position: absolute;
  right: 0;
  top: 0;
}

.topnav a:hover {
  background-color: #ddd;
  color: black;
}

.active {
  background-color: #04AA6D;
  color: white;
}





.btn {
    border: 2px solid black;
    background-color: white;
    color: black;
    padding: 14px 28px;
    font-size: 16px;
    cursor: pointer;
    border-radius: 5px;
  }
  
  /* Green */
  .qr {
    border-color: #04AA6D;
    color: green;
    text-align: center;
  }
  
  .qr:hover {
    background-color: #04AA6D;
    color: white;
    text-align: center;
  }

/* Red */
.exit {
    border-color: #f44336;
    color: red
  }
  
  .exit:hover {
    background: #f44336;
    color: white;
  }

  table, td, th {
    border: 1px solid black;
    height: 20px;
  }
  
  table {
    border-collapse: collapse;
    width: 400px;
  }