.wrapper {
  container-name: wrapper;
  container-type: size;
}

.my_mixin(@height) {
  @container wrapper (height < @height) {
    a {
      max-height: @height;
    }
  }
}

.my_mixin(100);
.my_mixin(200);
.my_mixin(300);

.wrapper {
  container-name: wrapper;
  container-type: size;
}
@container wrapper (height < 100) {
  a {
    max-height: 100;
  }
}
@container wrapper (height < 100) {
  a {
    max-height: 200;
  }
}
@container wrapper (height < 100) {
  a {
    max-height: 300;
  }
}

.wrapper {
  container-name: wrapper;
  container-type: size;
}
@container wrapper (height < 100) {
  a {
    max-height: 100;
  }
}
@container wrapper (height < 200) {
  a {
    max-height: 200;
  }
}
@container wrapper (height < 300) {
  a {
    max-height: 300;
  }
}