responsive-width-classes.scss

// bootstrap w-sm-50 ish 
// bootstrap/scss/utilities/_sizing.scss を参考に作成
@each $name, $width in $grid-breakpoints {
  @include media-breakpoint-up(md) {
    @each $size, $length in $sizes {
      .w-#{$name}-#{$size} { width: $length !important; }
    }
  }
}