Error with CSS-Variables

I am not pretty sure about the error. I have made a screenshot and attached the .scss-file where it occurs.

Thanks in advance, Dennis

/**
* This is a card component for displaying text-/media-content in a grid.
**/

$cards-grid-size: 3;
$card-margin: $site-frame-width * 2 / 4;

.c-cards {
  margin: - $card-margin;
  --cards-grid-size: 3;// $cards-grid-size;

  @include media("<small") {
    --cards-grid-size: 1;
  }
  @include media(">=small","<large") {
    --cards-grid-size: 2;
  }
  @include media(">=very-large") {
    --cards-grid-size: 4;
  }
}


.c-card {
  float: left;
  width: #{100% * (1 / $cards-grid-size)};
  width: calc(100% * 1 / var(--cards-grid-size));
  padding: $card-margin;

  &--isHidden {
    display: none;
  }

  // Double Sizing of 2x2 one
  &--hasPreviewRatio2x2 {
    width: #{100% * (2 / $cards-grid-size)};
    width: calc(100% * 2 / var(--cards-grid-size));
  }

  // Hover-Effect
  filter: saturate(75%);
  transition: $base-transition;
  &:hover, &:focus {
    filter: saturate(120%);
    // transform: translate(0, -3px);
  }

  .imageset,
  img,
  video {
    background: $color-gray-ultralight;
  }
}


/* Preview-Images */

// .c-card--hasPreviewImage {
//    ...
// }


/* Preview-Videos */

// .c-card--hasPreviewVideo {
//    ...
// }


/* Different Media-Ratios for Images & Video */

.c-card--hasPreviewRatio1x1 > .c-card__media,
.c-card--hasPreviewRatio2x2 > .c-card__media {
  display: block;
  position: relative;


  &:before {
    content: '';
    display: block;
    width: 100%;
    padding-top: (1 / 1) * 100%;
  }

  > .imageset,
  > img,
  > video {
    position: absolute !important;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
  }
  > video {
    width: 100%;
    height: 100%;
  }
}
.c-card--hasPreviewRatio1x1\.62 > .c-card__media:before {
  padding-top: (1.62 / 1) * 100%;
}
.c-card--hasPreviewRatio1\.62x1 > .c-card__media:before {
  padding-top: (1 / 1.62) * 100%;
}



/* Preview-Text */

.c-card__quote {
  background: $color-gray-ultralight;
  color: $color-gray-ultradark;
  @include font-monospace;
  @include font-size(13px);
  line-height: 1.6;
  padding: 1rem;
  font-style: italic;
  border-top: 3px $color-gray-light solid;

  + .c-card__info {
    border-top: 0;
    transform: translate3d(0, 0, 0);
  }
}

/* Info with Title, Summary & Tags */

.c-card__info {
  @include font-monospace();
  display: block;
  border-top: 2px white solid;
  background: $color-gray-ultradark;
  background: black;
  color: white;
  position: relative;
  padding: .8rem 1rem;
  transition: $base-transition;
  transform: translate3d(0, -1px, 0);
}

.c-card__title {
  display: block;
  color: inherit;
  text-decoration: none;
  margin-bottom: .3rem;

  &:last-child {
    margin-bottom: .1rem;
  }

  h2 {
    margin: 0;
    letter-spacing: .2px;
    @include font-size(15px);
  }

  .o-icon {
    opacity: 0;
    transform: translateX(-3px);
    transition: $base-transition;

    .c-card:hover &,
    .c-card:focus & {
      transform: translateX(0);
      opacity: 1;
    }
  }
}

.c-card__tags {
  margin: 0;
  text-overflow: ellipsis;
  width: 100%;

  ul {
    padding: 0;
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    margin: -.25rem;
  }

  a {
    @include font-size(12px);
    text-decoration: none;
    color: $color-gray;
    margin: .25rem;
  }

  ul > li {


  }
}

[adrianbienias]

VS Code 1.25.1

Please check validity of the block starting from line #3 CSScomb Core version: 4.2.0

1 | :root { 2 | --test-var: #fff; 3*| }

Syntax: css Gonzales PE version: 3.4.7

[StructByLightning]

As far as I can tell, #275 is about scss variables but this error occurs when you try to declare a plain css variable.

Unsupported beautification result 'Parsing error: Please check validity of the block starting from line #19
CSScomb Core version: 4.2.0
18 | :root {
19*|   --body-bg: #020202;
20 | }
Syntax: scss
Gonzales PE version: 3.4.7'.