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

.highlight {

  background: var(--highlight-background);
  margin-bottom: 26px;

  //TODO  Need fixed the copy button show position.
  div:first-child {
    display: absolute;
    overflow-x: scroll
  }

  pre {
    position: relative;
  }

  table tbody tr {
    //TODO Fixed the too long code line over
    // layout background color.
    background: #272822;    
  }

  /* pre > code span {
    white-space: break-spaces;
    overflow: hidden;
    word-break: break-all;
    word-wrap: break-word;
  } */
}

@if $codeblock_copy_btn_enable {

  .highlight:hover .copy-btn, pre:hover .copy-btn {
    opacity: 1;
  }

  .copy-btn {
    color: $black-dim;
    cursor: pointer;
    line-height: 1.6;
    opacity: 0;
    padding: 2px 6px;
    position: absolute;
    right: 8px;
    top: 4px;
    transition: opacity $transition-ease;
    background: var(--highlight-background);

    @if $codeblock_style == 'flat' {
      background: white;
      border: 0;
      font-size: $font-size-smaller;
      
    } @else if $codeblock_style == 'mac' {
      color: var(--highlight-foreground);
      font-size: 14px;
      border-radius: 3px;
    } @else {
      background-color: $gainsboro;
      background-image: linear-gradient(#fcfcfc, $gainsboro);
      border: 1px solid #d5d5d5;
      border-radius: 3px;
      font-size: $font-size-smaller;
      
    }
  }
}

@if $codeblock_style == 'mac' {
  .highlight {
    border-radius: 5px;
    box-shadow: 0 10px 30px 0 rgba(0, 0, 0, .4);
    padding-top: 30px;

    .table-container {
      border-radius: 0 0 5px 5px;
    }

    &::before {
      background: #fc625d;
      box-shadow: 20px 0 #fdbc40, 40px 0 #35cd4b;
      margin-top: -20px;
      margin-left: 10px;
      position: absolute;
      @include round-icon(12px);
    }
  }
}