$radiuses: 5;

@mixin radius($size) {
  border-radius: var(--radius-#{$size});
}
@mixin radius_classes {
  @for $i from 0 through $radiuses {
    &.radius-#{$i} { 
      @include radius($i);
    }
  }
}

@mixin border_classes {
  &.border-width-sm {
    border-width: 1px;
  }
  &.border-width-md {
    border-width: 2px;
  }
  &.border-width-lg {
    border-width: 3px;
  }
}