Шаблон:Speech/styles.css

.speech {
  position: relative;
}

.speech:before {
  position: absolute;
  right: 0.25em;
  bottom: 1em;
  content: '';
  background-color: var(--color-notice-brown);
  width: 1em;
  height: 1em;
  transform: rotate(45deg);
  z-index: -1;
}