cssで縦縞(vertical-stripes)

vertical-stripes.scss

@mixin backgound-linear-gradient($value...){
  background: -moz-linear-gradient($value); 
  background: -webkit-linear-gradient($value);
  background: linear-gradient($value);
}

@mixin background-size($value...){
  -moz-background-size: $value;
  -webkit-background-size: $value;
  background-size: $value;
}

@mixin vertical-stripes($width: 100px, $height: 100px, $color1: black, $color2: white, $sima_num: 5){
  width: $width;
  height: $height;
  @include backgound-linear-gradient(left, $color1, $color1 50%, $color2 50%, $color2);
  @include background-size($width / $sima_num $height);
}

.vertical-stripes {
  $width: 100px;
  $height: 100px;
  $color1: black;
  $color2: white;
  $num: 5;
  @include vertical-stripes($width, $height, $color1, $color2, $num);
}