How can change the background color in Widget card

<?php

namespace App\Filament\Company\Widgets;

use Filament\Widgets\ChartWidget;

class ExpenseChart extends ChartWidget
{
    protected static ?string $heading = 'Egresos del mes';

    protected static ?int $sort = 3;

    protected static ?string $pollingInterval = null;

    public ?string $filter = 'today';

    protected static string $color = 'info';

   /*  protected function getFilters(): ?array
    {
        return [
            'today' => 'Today',
            'week' => 'Last week',
            'month' => 'Last month',
            'year' => 'This year',
        ];
    } */

    protected function getData(): array
    {
        //$activeFilter = $this->filter;

        return [
            'datasets' => [
                [
                    'label' => 'Egresos registrados',
                    'data' => [0, 89, 10, 21, 32, 45, 74, 65, 45, 37 ],
                ],
            ],
            'labels' => ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
        ];
    }

    protected function getType(): string
    {
        return 'line';
    }
}