i.icon.telegram {
  width: 24px;
  height: 24px;
  background: transparent;
  position: relative;
}

i.icon.telegram::before {
  content: "";
  position: absolute;
  width: 20px;
  height: 20px;
  background: white;
  border-radius: 50%;
  top: 2px;
  left: 2px;
}

i.icon.telegram::after {
  content: "";
  position: absolute;
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-bottom: 8px solid currentColor;
  transform: rotate(-30deg);
  top: 7px;
  left: 9px;
  color: #ffffff; /* Цвет бумажного самолетика */
}
