flags/less/flag-icons-base.less

.fib {
  background-size: contain;
  background-position: 50%;
  background-repeat: no-repeat;
}

.fi {
  .fib;
  position: relative;
  display: inline-block;
  width: unit((4 / 3), em);
  line-height: 1em;
  &:before {
    content: "\00a0";
  }
  &.fis {
    width: 1em;
  }
}

.flag-icon(@country) {
  .fi-@{country} {
    background-image: ~"url(@{flag-icons-path}@{flag-icons-rect-path}/@{country}.svg)";
    &.fis {
      background-image: ~"url(@{flag-icons-path}@{flag-icons-square-path}/@{country}.svg)";
    }
  }
}