discourse/plugins/chat/assets/stylesheets/common/chat-section.scss

.chat-section {
  border-bottom: 1px solid var(--primary-low);
  padding: 1rem;
  align-items: center;
  display: flex;
  flex-shrink: 0;
  box-sizing: border-box;

  &__text {
    align-items: baseline;
    display: flex;
    flex: 1 1 0;
    min-width: 0;
  }
}