.flag-icon {
  display: inline-block;
  width: 28px;
  height: 18px;
  flex: 0 0 auto;
  border: 1px solid rgba(15, 23, 42, 0.18);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.35) inset;
  overflow: hidden;
}

.flag-pl {
  background: linear-gradient(to bottom, #fff 0 50%, #dc143c 50% 100%);
}

.flag-de {
  background: linear-gradient(to bottom, #000 0 33.33%, #dd0000 33.33% 66.66%, #ffce00 66.66% 100%);
}

.flag-gb {
  background:
    linear-gradient(32deg, transparent 0 42%, #fff 42% 48%, #c8102e 48% 52%, #fff 52% 58%, transparent 58% 100%),
    linear-gradient(148deg, transparent 0 42%, #fff 42% 48%, #c8102e 48% 52%, #fff 52% 58%, transparent 58% 100%),
    linear-gradient(to right, transparent 0 42%, #fff 42% 58%, transparent 58% 100%),
    linear-gradient(to bottom, transparent 0 38%, #fff 38% 62%, transparent 62% 100%),
    linear-gradient(to right, transparent 0 45%, #c8102e 45% 55%, transparent 55% 100%),
    linear-gradient(to bottom, transparent 0 42%, #c8102e 42% 58%, transparent 58% 100%),
    #012169;
}