No italic font in Logbook card

How to remove italics from duration time?

My code

type: custom:logbook-card
entity: binary_sensor.datchik_dvizheniia_occupancy
  state: true
  duration: true
  start_date: true
  end_date: false
  icon: true
  separator: false
  entity_name: true
custom_logs: false
desc: true
title: Журнал событий
  style: |
    .duration {
     font-style: normal;

But “font-style: normal;” doesn’t work, nothing changes, but if I enter “font-weight: bold;” this will work

Does anyone have any idea?