🏗️ First time sync the css & js files from hexo theme NexT

assets/css/_common/scaffolding/highlight/copy-code.scss

@@ -0,0 +1,55 @@
+.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;
+  transition: opacity $transition-ease;
+
+  @if hexo-config('codeblock.copy_button.style') == 'flat' {
+    background: white;
+    border: 0;
+    font-size: $font-size-smaller;
+    right: 0;
+    top: 0;
+  } @else if hexo-config('codeblock.copy_button.style') == 'mac' {
+    color: var(--highlight-foreground);
+    font-size: 14px;
+    right: 0;
+    top: 2px;
+  } @else {
+    background-color: $gainsboro;
+    background-image: linear-gradient(#fcfcfc, $gainsboro);
+    border: 1px solid #d5d5d5;
+    border-radius: 3px;
+    font-size: $font-size-smaller;
+    right: 4px;
+    top: 8px;
+  }
+}
+
+@if hexo-config('codeblock.copy_button.style') == 'mac' {
+  figure.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;
+      left: 12px;
+      margin-top: -20px;
+      position: absolute;
+      @include round-icon(12px);
+    }
+  }
+}

assets/css/_common/scaffolding/highlight/index.scss

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+// 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;
+  }
+}