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@mixin bp-large {
  @media only screen and (max-width: 60em) {
    @content;
  }
}

@mixin bp-medium {
  @media only screen and (max-width: 40em) {
    @content;
  }
}

@mixin bp-small {
  @media only screen and (max-width: 30em) {
    @content;
  }
}

/* Usage */

.sidebar {
  width: 60%;
  float: left;
  margin: 0 2% 0 0;
  @include bp-small {
    width: 100%;
    float: none;
    margin: 0;
  }
}

/* Output */

.sidebar {
  width: 60%;
  float: left;
  margin: 0 2% 0 0;
  @media only screen and (max-width: 30){
    .sidebar{width: 100%; float: none; margin: 0;}
  }
}