body {
      font-family: Arial, sans-serif;
      padding: 30px;
      max-width: 600px;
      margin: auto;
      background: #414141;
    }
    h2 {
      text-align: center;
	  color: #f4f4f4;
    }
    input[type="text"] {
      padding: 10px;
      width: 80%;
      margin: 10px auto;
      display: block;
      font-size: 16px;
      border: 1px solid #ccc;
      border-radius: 5px;
    }
    button {
      padding: 10px 20px;
      margin: 10px;
      font-size: 16px;
      border: none;
      border-radius: 5px;
      cursor: pointer;
    }
    #signinBtn { background-color: #4CAF50; color: white; }
    #signoutBtn { background-color: #f44336; color: white; }
    #message { margin: 10px 0; font-weight: bold; text-align: center; color: #f4f4f4;}
    table {
      width: 100%;
      border-collapse: collapse;
      margin-top: 20px;
      background: white;
    }
    th, td {
      padding: 10px;
      border: 1px solid #ddd;
      text-align: center;
    }
    th {
      background: #333;
      color: white;
    }