hugo-theme-next/assets/css/_common/scaffolding/highlight/index.scss

// Use `@use` to fix issue #67
@import '(theme.highlight.enable && theme.highlight.light.file) ? theme.highlight.light.file : null';
@import '(theme.prism.enable && theme.prism.light) ? theme.prism.light : null';
@import '(theme.prism.enable && theme.prism.number) ? theme.prism.number : null';

@media (prefers-color-scheme: dark) {
  @import '(theme.darkmode && theme.highlight.enable && theme.highlight.dark.file) ? theme.highlight.dark.file : null';
  @import '(theme.darkmode && theme.prism.enable && theme.prism.dark) ? theme.prism.dark : null';
}

@import 'theme.codeblock.copy_button.enable ? "copy-code" : null';

// Placeholder: %code-inline %code-block
%code-inline {
  background: var(--highlight-background);
  color: var(--highlight-foreground);
}

%code-block {
  @extend %code-inline;
  line-height: $line-height-code-block;
  margin: 0 auto 20px;
}

%figcaption {
  background: var(--highlight-gutter-background);
  color: var(--highlight-foreground);
  display: flow-root;
  font-size: $table-font-size;
  line-height: 1.2;
  padding: .5em;

  a {
    color: var(--highlight-foreground);
    float: right;

    &:hover {
      border-bottom-color: var(--highlight-foreground);
    }
  }
}

pre, code {
  font-family: $code-font-family;
}

code {
  @extend %code-inline;
  border-radius: 3px;
  font-size: $table-font-size;
  padding: 2px 4px;
  @include word-wrap();
}

kbd {
  @extend %code-inline;
  border: 2px solid $grey-light;
  border-radius: .2em;
  box-shadow: .1em .1em .2em rgba(0, 0, 0, .1);
  font-family: inherit;
  padding: .1em .3em;
  white-space: nowrap;
}

// `highlight.line_number: false` and `highlight.wrap: false`
// in Hexo config generates code.highlight elements
figure.highlight {
  @extend %code-block;
  position: relative;

  pre {
    border: 0;
    margin: 0;
    padding: 10px 0;
  }

  table {
    border: 0;
    margin: 0;
    width: auto;
  }

  td {
    border: 0;
    padding: 0;
  }

  figcaption {
    @extend %figcaption;
  }

  .gutter {
    @include disable-user-select();

    pre {
      background: var(--highlight-gutter-background);
      color: var(--highlight-gutter-foreground);
      padding-left: 10px;
      padding-right: 10px;
      text-align: right;
    }
  }

  .code pre {
    padding-left: 10px;
    width: 100%;
  }

  // See https://github.com/next-theme/hexo-theme-next/discussions/410
  .marked {
    background: rgba(0, 0, 0, .3);
  }
}

// See https://github.com/hexojs/hexo-util/pull/229
pre .caption, pre figcaption {
  @extend %figcaption;
  margin-bottom: 10px;
}

.gist table {
  width: auto;

  td {
    border: 0;
  }
}

pre {
  @extend %code-block;
  overflow: auto;
  padding: 10px;
  position: relative;

  code {
    background: none;
    padding: 0;
    text-shadow: none;
  }
}