.esp-flag::before{ 
  background: url(https://cdn.countryflags.com/thumbs/spain/flag-round-250.png)
}
.eng-flag::before{ 
  background: url(https://cdn.countryflags.com/thumbs/united-states-of-america/flag-round-250.png)
}
.por-flag::before{ 
  background: url(https://cdn.countryflags.com/thumbs/portugal/flag-round-250.png)
}
.fra-flag::before{ 
  background: url(https://cdn.countryflags.com/thumbs/france/flag-round-250.png)
}
.chn-flag::before{ 
  background: url(https://cdn.countryflags.com/thumbs/china/flag-round-250.png)
}
.rus-flag::before{ 
  background: url(https://cdn.countryflags.com/thumbs/russia/flag-round-250.png)
}
.pol-flag::before{ 
  background: url(https://cdn.countryflags.com/thumbs/poland/flag-round-250.png)
}
.ita-flag::before{ 
  background: url(https://cdn.countryflags.com/thumbs/italy/flag-round-250.png)
}
.mx-flag::before{ 
  background: url(https://cdn.countryflags.com/thumbs/mexico/flag-round-250.png)
}



.esp-flag::before{ 
  background: url(esp.png)
}
.eng-flag::before{ 
  background: url(eng.png)
}