src/static/css/thread_toolbar.css

/* Small adjustement to reduce spacing, since it's excessive when adding the toolbar. */
body.TWPT-threadtoolbar-shown ec-thread .scTailwindThreadThreadcontentreplies-section {
  padding-top: 0.5rem;
}

/* Hide reply button when a thread is flattened, since it might not work correctly */
@supports selector(:has(div)) {
  body.TWPT-flattenthreads-enabled ec-thread sc-tailwind-thread-message-message-list:last-child .scTailwindThreadMessageMessagecardsub-content:not(:has(.scTailwindThreadMessageMessagecardreply-editor)) {
    display: none;
  }
}
/* Fallback support for browsers which do not support :has(...) */
@supports not selector(:has(div)) {
  body.TWPT-flattenthreads-enabled ec-thread sc-tailwind-thread-message-message-list:last-child .scTailwindThreadMessageMessagecardsub-content .scTailwindThreadMessageMessagecardaction {
    padding: 0;
  }

  body.TWPT-flattenthreads-enabled ec-thread sc-tailwind-thread-message-message-list:last-child .scTailwindThreadMessageMessagecardsub-content .scTailwindThreadMessageMessagecardaction .scTailwindThreadMessageMessagecardadd-comment {
    display: none;
  }

  body.TWPT-flattenthreads-enabled ec-thread sc-tailwind-thread-message-message-list:last-child .scTailwindThreadMessageMessagecardsub-content .scTailwindThreadMessageMessagecardaction .scTailwindThreadMessageMessagecardreply-editor {
    margin: 0.5rem;
  }

  @media (min-width: 37.5rem) {
    body.TWPT-flattenthreads-enabled ec-thread sc-tailwind-thread-message-message-list:last-child .scTailwindThreadMessageMessagecardsub-content .scTailwindThreadMessageMessagecardaction .scTailwindThreadMessageMessagecardreply-editor {
      margin: 0.5rem 3.5rem;
    }
  }
}