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

assets/css/_common/outline/sidebar/index.scss

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+.sidebar-inner {
+  color: $grey-dark;
+  // Init Sidebar & TOC inner dimensions on all pages and for all schemes.
+  $offset : if(($scheme == 'Pisces') or ($scheme == 'Gemini'), $sidebar-offset, $sidebar-padding);
+  max-height: calc(100vh - #{$offset * 2});
+  padding: $sidebar-padding 10px;
+  text-align: center;
+  @include flex-column();
+}
+
+.site-overview-item:not(:first-child) {
+  margin-top: 10px;
+}
+
+.cc-license {
+  .cc-opacity {
+    border-bottom: 0;
+    opacity: .7;
+
+    &:hover {
+      opacity: .9;
+    }
+  }
+
+  img {
+    display: inline-block;
+  }
+}
+
+@import 'sidebar-author';
+@import 'sidebar-author-links';
+@import 'sidebar-button';
+@import 'sidebar-blogroll';
+@import 'sidebar-dimmer';
+@import 'sidebar-nav';
+@import 'sidebar-toggle';
+@import 'sidebar-toc';
+@import 'site-state';

assets/css/_common/outline/sidebar/sidebar-author-links.scss

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+.links-of-author {
+  a {
+    font-size: $font-size-smaller;
+  }
+
+  @if not hexo-config('social_icons.icons_only') {
+    .fa, .fab, .far, .fas {
+      margin-right: 2px;
+    }
+  }
+}

assets/css/_common/outline/sidebar/sidebar-author.scss

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+.site-author-image {
+  border: $site-author-image-border-width solid $site-author-image-border-color;
+  max-width: $site-author-image-width;
+  padding: 2px;
+
+  @if hexo-config('avatar.rounded') {
+    border-radius: 50%;
+  }
+
+  @if hexo-config('avatar.rotated') {
+    transition: transform 1s ease-out;
+
+    &:hover {
+      transform: rotateZ(360deg);
+    }
+  }
+}
+
+.site-author-name {
+  color: $site-author-name-color;
+  font-weight: $site-author-name-weight;
+  margin: $site-author-name-margin;
+}
+
+.site-description {
+  color: $site-description-color;
+  font-size: $site-description-font-size;
+  margin-top: $site-description-margin-top;
+}

assets/css/_common/outline/sidebar/sidebar-blogroll.scss

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+.links-of-blogroll {
+  font-size: $font-size-smaller;
+}
+
+.links-of-blogroll-title {
+  font-size: $font-size-small;
+  font-weight: 600;
+  margin-top: 0;
+}
+
+.links-of-blogroll-list {
+  list-style: none;
+  margin: 0;
+  padding: 0;
+}

assets/css/_common/outline/sidebar/sidebar-button.scss

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+.sidebar .sidebar-button {
+  &:not(:first-child) {
+    margin-top: 15px;
+  }
+
+  button {
+    @include button($orange);
+    border: 1px solid $orange;
+    border-radius: 4px;
+
+    .fa, .fab, .far, .fas {
+      margin-right: 5px;
+    }
+  }
+}

assets/css/_common/outline/sidebar/sidebar-dimmer.scss

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+.sidebar-dimmer {
+  display: none;
+}
+
+@include tablet-mobile() {
+  .sidebar-dimmer {
+    background: black;
+    display: block;
+    height: 100%;
+    left: 0;
+    opacity: 0;
+    position: fixed;
+    top: 0;
+    transition: visibility .4s, opacity .4s;
+    visibility: hidden;
+    width: 100%;
+    z-index: $zindex-1;
+
+    .sidebar-active & {
+      opacity: .7;
+      visibility: visible;
+    }
+  }
+}

assets/css/_common/outline/sidebar/sidebar-nav.scss

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+// Sidebar Navigation
+.sidebar-nav {
+  display: none;
+  margin: 0;
+  padding-bottom: 20px;
+  padding-left: 0;
+
+  .sidebar-nav-active & {
+    display: block;
+  }
+
+  li {
+    border-bottom: 1px solid transparent;
+    color: $sidebar-nav-color;
+    cursor: pointer;
+    display: inline-block;
+    font-size: $font-size-small;
+
+    &.sidebar-nav-overview {
+      margin-left: 10px;
+    }
+
+    &:hover {
+      color: $sidebar-nav-hover-color;
+    }
+  }
+}
+
+.sidebar-toc-active .sidebar-nav-toc, .sidebar-overview-active .sidebar-nav-overview {
+  border-bottom-color: $sidebar-highlight;
+  color: $sidebar-highlight;
+
+  &:hover {
+    color: $sidebar-highlight;
+  }
+}
+
+// Need for Sidebar/TOC inner scrolling if content taller then viewport.
+.sidebar-panel-container {
+  flex: 1;
+  overflow-x: hidden;
+  overflow-y: auto;
+}
+
+.sidebar-panel {
+  display: none;
+}
+
+.sidebar-overview-active .site-overview-wrap {
+  // Flexbox layout makes it possible to reorder the child
+  // elements of .site-overview-item through the `order` CSS property
+  @include flex-column();
+}
+
+.sidebar-toc-active .post-toc-wrap {
+  display: block;
+}

assets/css/_common/outline/sidebar/sidebar-toc.scss

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+@if hexo-config('toc.enable') {
+  .post-toc {
+    font-size: $font-size-small;
+
+    ol {
+      list-style: none;
+      margin: 0;
+      padding: 0 2px 5px 10px;
+      text-align: left;
+
+      > ol {
+        padding-left: 0;
+      }
+
+      a {
+        transition: all $transition-ease;
+      }
+    }
+
+    .nav-item {
+      line-height: 1.8;
+      overflow: hidden;
+      text-overflow: ellipsis;
+
+      @if not hexo-config('toc.wrap') {
+        white-space: nowrap;
+      }
+    }
+
+    .nav {
+      .nav-child {
+        display: if(hexo-config('toc.expand_all'), block, none);
+      }
+
+      .active > .nav-child {
+        display: block;
+      }
+
+      .active-current > .nav-child {
+        display: block;
+
+        > .nav-item {
+          display: block;
+        }
+      }
+
+      .active > a {
+        border-bottom-color: $sidebar-highlight;
+        color: $sidebar-highlight;
+      }
+
+      .active-current > a {
+        color: $sidebar-highlight;
+
+        &:hover {
+          color: $sidebar-highlight;
+        }
+      }
+    }
+  }
+}

assets/css/_common/outline/sidebar/sidebar-toggle.scss

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+.sidebar-toggle {
+  bottom: 45px;
+  height: 12px;
+  padding: 6px 5px;
+  width: 14px;
+  @include sidebar-toggle();
+}
+
+.sidebar-toggle:hover .toggle-line {
+  background: $sidebar-highlight;
+}
+
+@media (any-hover: hover) {
+  body:not(.sidebar-active) .sidebar-toggle:hover {
+    @include toggle-arrow(hexo-config('sidebar.position'));
+  }
+}
+
+.sidebar-active .sidebar-toggle {
+  @include toggle-close(hexo-config('sidebar.position'));
+}

assets/css/_common/outline/sidebar/site-state.scss

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+@if hexo-config('site_state') {
+  .site-state {
+    @include flex-wrap();
+    line-height: 1.4;
+  }
+
+  .site-state-item {
+    // Fix issue #103
+    // The click area of the link becomes smaller
+    padding: 0 15px;
+
+    a {
+      border-bottom: 0;
+      display: block;
+    }
+  }
+
+  .site-state-item-count {
+    display: block;
+    font-size: $site-state-item-count-font-size;
+    font-weight: 600;
+  }
+
+  .site-state-item-name {
+    color: $site-state-item-name-color;
+    font-size: $site-state-item-name-font-size;
+  }
+}