discourse/app/assets/stylesheets/mobile/topic-footer.scss

html:not(.anon) #topic-footer-buttons {
  .topic-footer-main-buttons {
    width: 100%;
    justify-content: space-between;
    gap: 0.75rem;

    .btn,
    .topic-notifications-button .btn,
    .pinned-button .btn {
      font-size: var(--font-up-1-rem);
    }

    &__actions {
      gap: 0.75rem;
    }

    .d-button-label {
      display: none;
    }

    .pinned-button,
    .topic-notifications-button {
      .selected-name .name {
        display: none;
      }
    }

    .d-icon {
      margin-right: 0;
    }
  }
}