colmaris.fr/themes/hugo-blog-awesome/assets/sass/_dark.scss

@mixin dark-mode {
  body {
    color: $dark-text-base-color;
    background-color: $dark-black;
  }

  // Headings
  h1,
  h2,
  h3,
  h4,
  h5,
  h6 {
    color: $dark-white;
  }

  // Table
  table {
    thead {
      color: $dark-white;
      border-color: $dark-light;
    }

    th,
    td,
    tr {
      border-color: $dark-light;
    }
  }

  // Post
  .page-content {
    a {
      color: $dark-text-link-blue;

      &:hover,
      &:active,
      &:focus {
        color: $dark-text-link-blue-active;
      }
    }

    h3 {
      border-color: $dark-light;
    }

    h1,
    h2,
    h3,
    h4,
    h5,
    h6 {
      .anchor-head {
        color: $dark-text-link-blue;
      }
    }
  }

  // ToC
  .toc {
    background-color: $dark-toc-bg;
  }

  // Go to top
  #totop {
    color: $dark-text-base-color;
    background-color: $dark-go-top-bg;

    &:hover {
      background-color: $dark-go-top-bg-hover;
    }
  }

  // Inline code
  li>code,
  p>code {
    font-size: 0.9em;
    padding: 1px 3px;
    position: relative;
    top: -1px;
    color: $dark-inline-code-text;
    background-color: $dark-inline-code-bg;
    border-radius: 2px;
    border: 1px solid rgba(128, 128, 128, 0.1);
  }

  // kbd tag
  kbd {
    color: $dark-inline-code-text;
    background-color: $dark-inline-code-bg;
  }

  // horizontal rule
  hr {
    border-color: $dark-light;
  }

  // Post Meta
  .post-meta {
    color: $dark-gray;

    time {
      &::after {
        background-color: $dark-light;
      }
    }

    span[itemprop="author"] {
      border-color: $dark-light;
    }
  }

  // Link
  a {
    color: inherit;
    text-decoration-color: $dark-smoke;

    &:hover {
      color: $dark-text-link-blue;
    }

    &:focus {
      outline-color: rgba(44, 118, 246, 0.6);
    }
  }

  // List
  li {
    &:before {
      color: $dark-white;
    }
  }

  // Blockquote
  blockquote {
    color: $dark-blockquote-text;
    border-color: $dark-bloquote-border;
  }

  // Strong, Bold
  strong,
  b {
    color: $dark-white;
  }

  // Navbar
  .navbar {
    border-color: $dark-light;

    .menu {
      a#mode {
        .mode-sunny {
          display: block;
        }

        .mode-moon {
          display: none;
        }
      }

      .menu-link {
        color: $dark-white;
      }

      @include media-query($on-mobile) {
        background-color: $dark-black;
        border-color: $dark-light;

        input[type="checkbox"]:checked~.trigger {
          background: $dark-black;
        }
      }
    }
  }

  // Post Item
  .post-item {
    &:not(:first-child) {
      border-color: $dark-light;
    }

    .post-item-date {
      color: $dark-white;
    }

    .post-item-title {
      a {
        color: $dark-text-base-color;

        &:hover,
        &focus {
          color: $dark-white;
        }
      }
    }
  }

  // Post Navigation
  .post-nav {
    border-color: $dark-light;

    .post-nav-item {
      font-weight: $bold-weight;

      .post-title {
        color: $dark-white;
        opacity: 0.9;
      }

      &:hover,
      &:focus {
        .post-title {
          color: $dark-text-link-blue-active;
        }
      }

      .nav-arrow {
        color: $dark-gray;
      }
    }

    @include media-query($on-mobile) {
      .post-nav-item:nth-child(even) {
        border-color: $dark-light;
      }
    }
  }

  // Footer
  .footer {
    span.footer_item {
      color: $dark-white;
    }

    a.footer_item:not(:last-child) {
      color: $dark-white;
    }

    .footer_copyright {
      color: $dark-gray;
      opacity: 1;
    }
  }

  // 404 Page
  .not-found {
    .title {
      color: $dark-white;
      text-shadow: 1px 0px 0px $dark-text-link-blue;
    }

    .phrase {
      color: $dark-text-base-color;
    }

    .solution {
      color: $dark-text-link-blue;
    }

    .solution:hover {
      color: $dark-text-link-blue-active;
    }
  }

  .search-article {
    input[type="search"] {
      color: $dark-text-base-color;

      &::-webkit-input-placeholder {
        color: rgba(128, 128, 128, 0.8);
      }
    }
  }
}

// support JS disabled environment with media query
@media (prefers-color-scheme: dark) {
  // use "light" class to avoid style conflicts in js enabled environment
  html:not(.light) {
    @include dark-mode()
  }
}

html.dark {
  @include dark-mode()
}