Hello @Kestutis,
We regret to inform you that it is not possible to change the style of the widget in the theme, as it is the default style and any changes you wish to make would require extra customization.
Additional customization is outside the scope of our basic support.
If you would like to request this feature, please post your request here: https://www.8theme.com/taskboard/. If it receives enough votes from other customers, our development team will consider adding it to one of our future updates.
Best Regards,
8Theme’s Team