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Font Awesome 预置样式 v5.10.2
[class^=fa-], [class*=" fa-"], .fa {
  display: inline-block;
  font-family: 'Font Awesome 5 Free';
  font-style: normal;
  font-variant: normal;
  font-weight: 900;
  line-height: 1;
  text-rendering: auto;
  -moz-osx-font-smoothing: grayscale;
  -webkit-font-smoothing: antialiased;
}

[class^=fab-], [class*=" fab-"], .fab {
    font-family: 'Font Awesome 5 Brands';
}
Font Awesome Icons Regular(151)
Font Awesome Icons Solid(960)
Font Awesome Icons Brands(432)
图标来源(国内访问巨慢):https://fontawesome.com/icons?d=gallery&m=free