@mixin flex-row($justify: flex-start, $align: stretch) {
    display: flex;
    @if $justify != flex-start {
      justify-content: $justify;
    }
    @if $align != stretch {
      align-items: $align;
    }
  }
  
  @mixin variant($color, $background-color, $border-color) {
    color: $color;
    background-color: $background-color;
    border-color: $border-color;
  }
  