IE8 support

_hero-medium.less

// _hero-medium.less

.hero-medium {
  // medium screen code
}

ie.less

// ie.css

@import "hero-medium";

.hero-medium; //mixin from import

main.less

// main.css

@import "hero-medium";

#hero {
  // small screen code
}

@media only screen and (@medium) {
  .hero-medium; // mixin from import
}