body {
      background-color: #FFEDCA;
      font-family: Arial;
    }
    table {
      width: 80%;
      margin: 30px auto;
      border-collapse: collapse;
      background: white;
    }
    th, td {
      border: 1px solid #666;
      padding: 8px 12px;
      text-align: center;
    }
    th {
      background: #f0d6b2;
    }
    input[type="number"] {
      width: 60px;
    }
    .xoa-btn {
      padding: 4px 8px;
      background: #cc0000;
      color: white;
      border: none;
      cursor: pointer;
    }