---
title: "Theming: Customising Headers"
framework: javascript
version: "36.1.0"
---

# Theming: Customising Headers

Style grid header cells and column groups.

The grid exposes many theme parameters starting `header*` for customising header appearance:

```js
const myTheme = themeQuartz.withParams({
    headerHeight: '30px',
    headerTextColor: 'white',
    headerBackgroundColor: 'black',
    headerCellHoverBackgroundColor: 'rgba(80, 40, 140, 0.66)',
    headerCellMovingBackgroundColor: 'rgb(80, 40, 140)',
});
```

For the full list, see the [Headers section](https://www.ag-grid.com/javascript-data-grid/theming-api/#reference-headers) of the parameters reference.

When the theme parameters are not enough you can use CSS classes, in particular `ag-header`, `ag-header-cell`, and `ag-header-group-cell`:

```css
.ag-header {
    font-family: cursive;
}
.ag-header-group-cell {
    font-weight: normal;
    font-size: 22px;
}
.ag-header-cell {
    font-size: 18px;
}
```

#### Colour Customisation

```ts
import {
  GridApi,
  GridOptions,
  ModuleRegistry,
  createGrid,
  enableDevValidations,
  themeQuartz,
} from "ag-grid-community";
import { AllEnterpriseModule } from "ag-grid-enterprise";
import { IOlympicData } from "./interfaces";

// Enable extended validations only for development
if (process.env.NODE_ENV !== "production") {
  enableDevValidations();
}

ModuleRegistry.registerModules([AllEnterpriseModule]);

let gridApi: GridApi<IOlympicData>;

const myTheme = themeQuartz.withParams({
  headerHeight: "30px",
  headerTextColor: "white",
  headerBackgroundColor: "black",
  headerCellHoverBackgroundColor: "rgba(80, 40, 140, 0.66)",
  headerCellMovingBackgroundColor: "rgb(80, 40, 140)",
});

const gridOptions: GridOptions<IOlympicData> = {
  theme: myTheme,
  columnDefs: [
    {
      headerName: "Group 1",
      children: [{ field: "athlete", minWidth: 170 }, { field: "age" }],
    },
    {
      headerName: "Group 2",
      children: [
        { field: "country" },
        { field: "year" },
        { field: "date" },
        { field: "sport" },
        { field: "gold" },
        { field: "silver" },
        { field: "bronze" },
        { field: "total" },
      ],
    },
  ],
  defaultColDef: {
    editable: true,
    filter: true,
  },
};

const gridDiv = document.querySelector<HTMLElement>("#myGrid")!;
gridApi = createGrid(gridDiv, gridOptions);

fetch("https://www.ag-grid.com/example-assets/olympic-winners.json")
  .then((response) => response.json())
  .then((data: IOlympicData[]) => gridApi!.setGridOption("rowData", data));
```

[Live example: Colour Customisation](https://www.ag-grid.com/examples/theming-headers/header-customisation/typescript/)

## Header Column Borders and Resize Handles

Header Column Borders appear between every column, whereas Resize Handles only appear on resizeable columns (Group 1 in the example below).

```js
const myTheme = themeQuartz.withParams({
    headerColumnBorder: { color: 'purple' },
    headerColumnBorderHeight: '80%',

    headerColumnResizeHandleColor: 'orange',
    headerColumnResizeHandleHeight: '25%',
    headerColumnResizeHandleWidth: '5px',
});
```

#### Column Separators

```ts
import {
  GridApi,
  GridOptions,
  ModuleRegistry,
  createGrid,
  enableDevValidations,
  themeQuartz,
} from "ag-grid-community";
import { AllEnterpriseModule } from "ag-grid-enterprise";
import { IOlympicData } from "./interfaces";

// Enable extended validations only for development
if (process.env.NODE_ENV !== "production") {
  enableDevValidations();
}

ModuleRegistry.registerModules([AllEnterpriseModule]);

const myTheme = themeQuartz.withParams({
  headerColumnBorder: { color: "purple" },
  headerColumnBorderHeight: "80%",

  headerColumnResizeHandleColor: "orange",
  headerColumnResizeHandleHeight: "25%",
  headerColumnResizeHandleWidth: "5px",
});

let gridApi: GridApi<IOlympicData>;

const gridOptions: GridOptions<IOlympicData> = {
  theme: myTheme,
  columnDefs: [
    {
      headerName: "Group 1",
      children: [
        { field: "athlete", minWidth: 170, resizable: true },
        { field: "age", resizable: true },
      ],
      resizable: true,
    },
    {
      headerName: "Group 2",
      children: [
        { field: "country" },
        { field: "year" },
        { field: "date" },
        { field: "sport" },
        { field: "gold" },
        { field: "silver" },
        { field: "bronze" },
        { field: "total" },
      ],
    },
  ],
  defaultColDef: {
    editable: true,
    filter: true,
    resizable: false,
  },
};

const gridDiv = document.querySelector<HTMLElement>("#myGrid")!;
gridApi = createGrid(gridDiv, gridOptions);

fetch("https://www.ag-grid.com/example-assets/olympic-winners.json")
  .then((response) => response.json())
  .then((data: IOlympicData[]) => gridApi!.setGridOption("rowData", data));
```

[Live example: Column Separators](https://www.ag-grid.com/examples/theming-headers/header-customisation-columns/typescript/)

## Style Header on Filter

Each time a [Column Filter](https://www.ag-grid.com/javascript-data-grid/filtering/) is applied to a column, the CSS class `ag-header-cell-filtered` is added to the header. This can be used for adding style to headers that are filtered.

The example below adds some styling to `ag-header-cell-filtered`, so when you filter a column you will notice the column header change.

#### Style Header

```ts
import {
  AllCommunityModule,
  GridApi,
  GridOptions,
  ModuleRegistry,
  createGrid,
  enableDevValidations,
} from "ag-grid-community";
import { IOlympicData } from "./interfaces";

// Enable extended validations only for development
if (process.env.NODE_ENV !== "production") {
  enableDevValidations();
}

ModuleRegistry.registerModules([AllCommunityModule]);

let gridApi: GridApi<IOlympicData>;

const gridOptions: GridOptions<IOlympicData> = {
  columnDefs: [
    { field: "athlete" },
    { field: "age", maxWidth: 120 },
    { field: "country" },
    { field: "year", maxWidth: 120 },
    { field: "sport" },
    { field: "gold" },
    { field: "silver" },
    { field: "bronze" },
    { field: "total" },
  ],
  defaultColDef: {
    flex: 1,
    minWidth: 150,
    filter: true,
  },
  initialState: {
    filter: {
      filterModel: {
        country: {
          filterType: "text",
          type: "contains",
          filter: "us",
        },
      },
    },
  },
};

const gridDiv = document.querySelector<HTMLElement>("#myGrid")!;
gridApi = createGrid(gridDiv, gridOptions);

fetch("https://www.ag-grid.com/example-assets/olympic-winners.json")
  .then((response) => response.json())
  .then((data: IOlympicData[]) => gridApi!.setGridOption("rowData", data));
```

[Live example: Style Header](https://www.ag-grid.com/examples/theming-headers/style-header-on-filter/typescript/)

## Styling the First and Last Columns

You can style all first and last column headers (Grouped, Non-Grouped and Floating Filters) using CSS by targeting the `.ag-column-first` and `.ag-column-last` selectors as follows:

```css
.ag-header-group-cell.ag-column-first {
    background-color: #2244cc66; /* bluest */
}
.ag-header-cell.ag-column-first {
    background-color: #2244cc44; /* bluer */
}
.ag-floating-filter.ag-column-first {
    background-color: #2244cc22; /* blue */
}

.ag-header-group-cell.ag-column-last {
    background-color: #33cc3366; /* greenest */
}
.ag-header-cell.ag-column-last {
    background-color: #33cc3344; /* greener */
}
.ag-floating-filter.ag-column-last {
    background-color: #33cc3322; /* green */
}
```

#### Style Header

```ts
import {
  AllCommunityModule,
  GridApi,
  GridOptions,
  ModuleRegistry,
  createGrid,
  enableDevValidations,
} from "ag-grid-community";
import { IOlympicData } from "./interfaces";

// Enable extended validations only for development
if (process.env.NODE_ENV !== "production") {
  enableDevValidations();
}

ModuleRegistry.registerModules([AllCommunityModule]);

let gridApi: GridApi<IOlympicData>;

const gridOptions: GridOptions<IOlympicData> = {
  columnDefs: [
    {
      headerName: "Athlete Details",
      children: [
        { field: "athlete" },
        { field: "age", maxWidth: 120 },
        { field: "country" },
      ],
    },
    { field: "year", maxWidth: 100 },
    {
      headerName: "Sport Details",
      children: [
        { field: "total", columnGroupShow: "closed" },
        { field: "gold", columnGroupShow: "open" },
        { field: "silver", columnGroupShow: "open" },
        { field: "bronze", columnGroupShow: "open" },
      ],
    },
  ],
  defaultColDef: {
    flex: 1,
    minWidth: 150,
    filter: true,
    floatingFilter: true,
  },
};

const gridDiv = document.querySelector<HTMLElement>("#myGrid")!;
gridApi = createGrid(gridDiv, gridOptions);

fetch("https://www.ag-grid.com/example-assets/olympic-winners.json")
  .then((response) => response.json())
  .then((data: IOlympicData[]) => gridApi!.setGridOption("rowData", data));
```

[Live example: Style Header](https://www.ag-grid.com/examples/theming-headers/style-header-first-last/typescript/)