.panel {
    margin-bottom: 20px;
    background-color: #fff;
    border: 1px solid transparent;
    border-radius: 4px;
    -webkit-box-shadow: 0 1px 1px rgba(0, 0, 0, 0.05);
    box-shadow: 0 1px 1px rgba(0, 0, 0, 0.05);
  }
  
  .panel-body {
    padding: 15px;
  }
  
  .panel-heading {
    padding: 10px 15px;
    border-bottom: 1px solid transparent;
    border-top-left-radius: 3px;
    border-top-right-radius: 3px;
  }
  
  .panel-heading > .dropdown .dropdown-toggle {
    color: inherit;
  }
  
  .panel-title {
    margin-top: 0;
    margin-bottom: 0;
    font-size: 16px;
    color: inherit;
  }
  
  .panel-title > a {
    color: inherit;
  }
  
  .panel-footer {
    padding: 10px 15px;
    background-color: #f5f5f5;
    border-top: 1px solid #ddd;
    border-bottom-right-radius: 3px;
    border-bottom-left-radius: 3px;
  }
  
  .panel > .list-group {
    margin-bottom: 0;
  }
  
  .panel > .list-group .list-group-item {
    border-width: 1px 0;
    border-radius: 0;
  }
  
  .panel > .list-group:first-child .list-group-item:first-child {
    border-top: 0;
    border-top-left-radius: 3px;
    border-top-right-radius: 3px;
  }
  
  .panel > .list-group:last-child .list-group-item:last-child {
    border-bottom: 0;
    border-bottom-right-radius: 3px;
    border-bottom-left-radius: 3px;
  }
  
  .panel-heading + .list-group .list-group-item:first-child {
    border-top-width: 0;
  }
  
  .list-group + .panel-footer {
    border-top-width: 0;
  }
  
  /* Panel với bảng */
  .panel > .table,
  .panel > .table-responsive > .table,
  .panel > .panel-collapse > .table {
    margin-bottom: 0;
  }
  
  .panel > .table:first-child,
  .panel > .table-responsive:first-child > .table:first-child {
    border-top-left-radius: 3px;
    border-top-right-radius: 3px;
  }
  
  .panel > .table:last-child,
  .panel > .table-responsive:last-child > .table:last-child {
    border-bottom-right-radius: 3px;
    border-bottom-left-radius: 3px;
  }
  
  .panel > .panel-body + .table,
  .panel > .panel-body + .table-responsive {
    border-top: 1px solid #ddd;
  }
  
  .panel > .table-bordered,
  .panel > .table-responsive > .table-bordered {
    border: 0;
  }
  
  /* Panel nhóm */
  .panel-group {
    margin-bottom: 20px;
  }
  
  .panel-group .panel {
    margin-bottom: 0;
    border-radius: 4px;
  }
  
  .panel-group .panel + .panel {
    margin-top: 5px;
  }
  
  .panel-group .panel-heading {
    border-bottom: 0;
  }
  
  .panel-group .panel-heading + .panel-collapse > .panel-body {
    border-top: 1px solid #ddd;
  }
  
  .panel-group .panel-footer {
    border-top: 0;
  }
  
  .panel-group .panel-footer + .panel-collapse .panel-body {
    border-bottom: 1px solid #ddd;
  }
  
  /* Các kiểu panel */
  .panel-default {
    border-color: #ddd;
  }
  
  .panel-default > .panel-heading {
    color: #333;
    background-color: #f5f5f5;
    border-color: #ddd;
  }
  
  .panel-default > .panel-heading + .panel-collapse > .panel-body {
    border-top-color: #ddd;
  }
  
  .panel-primary {
    border-color: #428bca;
  }
  
  .panel-primary > .panel-heading {
    color: #fff;
    background-color: #428bca;
    border-color: #428bca;
  }
  
  .panel-primary > .panel-heading + .panel-collapse > .panel-body {
    border-top-color: #428bca;
  }
  
  .panel-success {
    border-color: #d6e9c6;
  }
  
  .panel-success > .panel-heading {
    color: #3c763d;
    background-color: #dff0d8;
    border-color: #d6e9c6;
  }
  
  .panel-info {
    border-color: #bce8f1;
  }
  
  .panel-info > .panel-heading {
    color: #31708f;
    background-color: #d9edf7;
    border-color: #bce8f1;
  }
  
  .panel-warning {
    border-color: #faebcc;
  }
  
  .panel-warning > .panel-heading {
    color: #8a6d3b;
    background-color: #fcf8e3;
    border-color: #faebcc;
  }
  
  .panel-danger {
    border-color: #ebccd1;
  }
  
  .panel-danger > .panel-heading {
    color: #a94442;
    background-color: #f2dede;
    border-color: #ebccd1;
  }