$breakpoint_sp: 767px;
$breakpoint_pc: 768px;
@mixin sp {
  @media screen and (max-width: $breakpoint_sp) {
    @content;
  }
}
@mixin pc {
  @media screen and (min-width: $breakpoint_pc) {
    @content;
  }
}
//使い方例
.container {
  @include pc {
    width: 980px;
    margin: 0 auto;
  }
  @include sp {
    width: 100%;
  }
}
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