How do I go about aligning the widgets on a custom dashboard?

I created a new dashboard and added widgets with the following code

public function getHeaderWidgets(): array
{
    return [
        AccountWidget::class,
        AppointmentCount::class,
    ];
}

public function getHeaderWidgets(): array
{
    return [
        AccountWidget::class,
        AppointmentCount::class,
    ];
}

public function getHeaderWidgets(): array
{
    return [
        AccountWidget::class,
        AppointmentCount::class,
    ];
}

public function getHeaderWidgets(): array
{
    return [
        AccountWidget::class,
        AppointmentCount::class,
    ];
}