@mixin dynamic-property($size: null, $property: null, $value:null, $unit: null) {
  @if ($size == null) {
    &-#{$value} {
      #{$property}: #{$value} !important;
    }
  }
  @if ($size != null) {
    &-#{$size}-#{$value} {
      #{$property}: #{$value} !important;
    }
  }
}