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Bootstrap Icons 预置样式 v1.8.3
.bi::before, [class^="bi-"]::before, [class*=" bi-"]::before {
  display: inline-block;
  font-family: bootstrap-icons;
  font-style: normal;
  font-variant: normal;
  font-weight: normal;
  line-height: 1;
  text-transform: none;
  vertical-align: -.125em;
  -moz-osx-font-smoothing: grayscale;
  -webkit-font-smoothing: antialiased;
}
Bootstrap Icons [ 第三方图标库,不依赖 Bootstrap ](1683)