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div.main {
  border: 1px solid #000;
}
@media (min-width: 750px) {
  div.main {
    float: left;
    width: 75%;
  }
}

// ----
// Sass (v3.4.13)
// Compass (v1.0.3)
// ----

@mixin respond-to($width){
  @media (min-width: $width){
    @content;
  }
}

div.main {
border: 1px solid #000;
  @include respond-to(750px){
    float: left;
    width: 75%;
  }
}