body {
      background: #f5f7fa;
      display: flex;
      align-items: center;
      justify-content: center;
      min-height: 100vh;
    }

    .login-container {
      width: 100%;
      max-width: 400px;
      border-radius: 0.75rem;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
      overflow: hidden;
    }

    .login-header {
      background: #2a6fb0;
      color: #fff;
      text-align: center;
      padding: 1.5rem 1rem;
      font-size: 1.25rem;
      font-weight: 600;
      line-height: 1.5;
    }

    .login-form {
      background: #55b6e0; 
      padding: 2rem;
      color: #fff;
      font-weight: bold;
    }

    .captcha img {
      border: 1px solid #ced4da;
      border-radius: 0.375rem;
      height: 45px;
    }

    .btn-refresh {
      margin-left: 8px;
      background: #2a6fb0;
      border: none;
      color: white;
      padding: 0.5rem 0.75rem;
      border-radius: 0.375rem;
      cursor: pointer;
      transition: background 0.2s;
    }

    .btn-refresh:hover {
      background: #0b5ed7;
    }

    .btn-success {
      background-color: #28a745;
      border: none;
    }

    .btn-success:hover {
      background-color: #218838;
    }
    
    #togglePassword {
      position:absolute;
      right:15px;
      top:50%;
      transform:translateY(-50%);
      cursor:pointer;
      font-size:18px;
      color:#6c757d;
    }