@for $i from 1 through 24 {
  @each $name, $color in $colors {
    .bor-#{$i}-#{$name} {
      border: #{$i}px solid $color;
    }
  }
}

@for $i from 1 through 50 {
  .bor-rad-#{$i} {
    border-radius: #{$i}px;
  }
}