SASS margin/padding helper. https://www.sassmeister.com/gist/7d88d9d5444704b9ae2ed600f0caf527

SassMeister-input.scss

// ----
// libsass (v3.5.4)
// ----

@mixin spacing-helpers(
  $style,
  $sizes: (0, 5, 10, 15, 20, 25, 30, 50),
  $positions: ('', 'top', 'left', 'bottom', 'right')
) {
  @each $size in $sizes {
    @each $position in $positions {
      .#{str-slice($style, 0, 1)}#{str-slice($position, 0, 1)}-#{$size} {
        #{if($position == '', $style, #{$style}-#{$position})}: $size + px;
      }
    }
  } 
}

@include spacing-helpers(margin);
@include spacing-helpers(padding);

SassMeister-output.css

.m-0 {
  margin: 0px;
}

.mt-0 {
  margin-top: 0px;
}

.ml-0 {
  margin-left: 0px;
}

.mb-0 {
  margin-bottom: 0px;
}

.mr-0 {
  margin-right: 0px;
}

.m-5 {
  margin: 5px;
}

.mt-5 {
  margin-top: 5px;
}

.ml-5 {
  margin-left: 5px;
}

.mb-5 {
  margin-bottom: 5px;
}

.mr-5 {
  margin-right: 5px;
}

.m-10 {
  margin: 10px;
}

.mt-10 {
  margin-top: 10px;
}

.ml-10 {
  margin-left: 10px;
}

.mb-10 {
  margin-bottom: 10px;
}

.mr-10 {
  margin-right: 10px;
}

.m-15 {
  margin: 15px;
}

.mt-15 {
  margin-top: 15px;
}

.ml-15 {
  margin-left: 15px;
}

.mb-15 {
  margin-bottom: 15px;
}

.mr-15 {
  margin-right: 15px;
}

.m-20 {
  margin: 20px;
}

.mt-20 {
  margin-top: 20px;
}

.ml-20 {
  margin-left: 20px;
}

.mb-20 {
  margin-bottom: 20px;
}

.mr-20 {
  margin-right: 20px;
}

.m-25 {
  margin: 25px;
}

.mt-25 {
  margin-top: 25px;
}

.ml-25 {
  margin-left: 25px;
}

.mb-25 {
  margin-bottom: 25px;
}

.mr-25 {
  margin-right: 25px;
}

.m-30 {
  margin: 30px;
}

.mt-30 {
  margin-top: 30px;
}

.ml-30 {
  margin-left: 30px;
}

.mb-30 {
  margin-bottom: 30px;
}

.mr-30 {
  margin-right: 30px;
}

.m-50 {
  margin: 50px;
}

.mt-50 {
  margin-top: 50px;
}

.ml-50 {
  margin-left: 50px;
}

.mb-50 {
  margin-bottom: 50px;
}

.mr-50 {
  margin-right: 50px;
}

.p-0 {
  padding: 0px;
}

.pt-0 {
  padding-top: 0px;
}

.pl-0 {
  padding-left: 0px;
}

.pb-0 {
  padding-bottom: 0px;
}

.pr-0 {
  padding-right: 0px;
}

.p-5 {
  padding: 5px;
}

.pt-5 {
  padding-top: 5px;
}

.pl-5 {
  padding-left: 5px;
}

.pb-5 {
  padding-bottom: 5px;
}

.pr-5 {
  padding-right: 5px;
}

.p-10 {
  padding: 10px;
}

.pt-10 {
  padding-top: 10px;
}

.pl-10 {
  padding-left: 10px;
}

.pb-10 {
  padding-bottom: 10px;
}

.pr-10 {
  padding-right: 10px;
}

.p-15 {
  padding: 15px;
}

.pt-15 {
  padding-top: 15px;
}

.pl-15 {
  padding-left: 15px;
}

.pb-15 {
  padding-bottom: 15px;
}

.pr-15 {
  padding-right: 15px;
}

.p-20 {
  padding: 20px;
}

.pt-20 {
  padding-top: 20px;
}

.pl-20 {
  padding-left: 20px;
}

.pb-20 {
  padding-bottom: 20px;
}

.pr-20 {
  padding-right: 20px;
}

.p-25 {
  padding: 25px;
}

.pt-25 {
  padding-top: 25px;
}

.pl-25 {
  padding-left: 25px;
}

.pb-25 {
  padding-bottom: 25px;
}

.pr-25 {
  padding-right: 25px;
}

.p-30 {
  padding: 30px;
}

.pt-30 {
  padding-top: 30px;
}

.pl-30 {
  padding-left: 30px;
}

.pb-30 {
  padding-bottom: 30px;
}

.pr-30 {
  padding-right: 30px;
}

.p-50 {
  padding: 50px;
}

.pt-50 {
  padding-top: 50px;
}

.pl-50 {
  padding-left: 50px;
}

.pb-50 {
  padding-bottom: 50px;
}

.pr-50 {
  padding-right: 50px;
}