webapp/src/styles/_grid.scss

// Миксин для media-breakpoint-up
@mixin media-breakpoint-up($breakpoint, $breakpoints: $grid-breakpoints) {
  $min-width: map-get($breakpoints, $breakpoint);

  @if $min-width {
    @media (min-width: #{$min-width}) {
      @content;
    }
  } @else {
    @warn "Нет валидного брейкпоинта для '#{$breakpoint}'.";
  }
}

// Миксин для media-breakpoint-down
@mixin media-breakpoint-down($breakpoint, $breakpoints: $grid-breakpoints) {
  $max-width: map-get($breakpoints, $breakpoint) - 0.02px;

  @if $max-width {
    @media (max-width: #{$max-width}) {
      @content;
    }
  } @else {
    @warn "Нет валидного брейкпоинта для '#{$breakpoint}'.";
  }
}

// Миксин для media-breakpoint-between
@mixin media-breakpoint-between($lower, $upper, $breakpoints: $grid-breakpoints) {
  $min-width: map-get($breakpoints, $lower);
  $max-width: map-get($breakpoints, $upper) - 0.02px;

  @if $min-width and $max-width {
    @media (min-width: #{$min-width}) and (max-width: #{$max-width}) {
      @content;
    }
  } @else {
    @warn "Нет валидных брейкпоинтов для '#{$lower}' или '#{$upper}'.";
  }
}

// Миксин make-container
@mixin make-container($max-widths: $container-max-widths, $gutter: $grid-gutter-width) {
  width: 100%;
  padding-right: $gutter;
  padding-left: $gutter;
  margin-right: auto;
  margin-left: auto;

  @each $breakpoint, $max-width in $max-widths {
    @include media-breakpoint-up($breakpoint, $grid-breakpoints) {
      max-width: #{$max-width};
    }
  }
}

// Миксин make-row
@mixin make-row($gutter: $grid-gutter-width) {
  --gutter-x: #{$gutter};
  --gutter-y: 0;

  display: flex;
  flex-wrap: wrap;
  margin-top: calc(-1 * var(--gutter-y));
  margin-right: calc(-0.5 * var(--gutter-x));
  margin-left: calc(-0.5 * var(--gutter-x));
}

// Миксин make-col-ready
@mixin make-col-ready() {
  box-sizing: border-box;
  flex-shrink: 0;
  width: 100%;
  max-width: 100%;
  padding-right: calc(var(--gutter-x) * 0.5);
  padding-left: calc(var(--gutter-x) * 0.5);
  margin-top: var(--gutter-y);
}

// Миксин make-col
@mixin make-col($size: false, $columns: $grid-columns) {
  @if $size {
    flex: 0 0 auto;
    width: calc(100% * #{calc($size / $columns)});
  } @else {
    flex: 1 1 0;
    max-width: 100%;
  }
}

// Миксин make-col-auto
@mixin make-col-auto() {
  flex: 0 0 auto;
  width: auto;
}

// Миксин make-col-offset
@mixin make-col-offset($size, $columns: $grid-columns) {
  $num: calc($size / $columns);

  margin-left: if($num == 0, 0, calc(100% * #{$num}));
}

// Миксин row-cols
@mixin row-cols($count) {
  > * {
    flex: 0 0 auto;
    width: 100% / $count;
  }
}

// Миксин make-grid-columns
@mixin make-grid-columns($columns: $grid-columns, $breakpoints: $grid-breakpoints) {
  @each $breakpoint, $value in $breakpoints {
    $infix: if($breakpoint == 'xs', '', "-#{$breakpoint}");

    @include media-breakpoint-up($breakpoint, $breakpoints) {
      @for $i from 1 through $columns {
        .col#{$infix}-#{$i} {
          @include make-col($i, $columns);
        }

        .offset#{$infix}-#{$i} {
          @include make-col-offset($i, $columns);
        }
      }
    }
  }
}

// Генерация классов контейнера и ряда
.container,
.container-fluid {
  @include make-container($container-max-widths, $grid-gutter-width);
}

.row {
  @include make-row;

  > * {
    @include make-col-ready;
  }
}

// Генерация классов столбцов и смещений
@include make-grid-columns($grid-columns, $grid-breakpoints);