mkdocs-material/src/assets/stylesheets/extensions/pymdown/_highlight.scss

////
/// Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>
///
/// Permission is hereby granted, free of charge, to any person obtaining a
/// copy of this software and associated documentation files (the "Software"),
/// to deal in the Software without restriction, including without limitation
/// the rights to use, copy, modify, merge, publish, distribute, sublicense,
/// and/or sell copies of the Software, and to permit persons to whom the
/// Software is furnished to do so, subject to the following conditions:
///
/// The above copyright notice and this permission notice shall be included in
/// all copies or substantial portions of the Software.
///
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
/// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
/// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
/// DEALINGS
////

// ----------------------------------------------------------------------------
// Rules
// ----------------------------------------------------------------------------

// When pymdownx.superfences is enabled but codehilite is disabled,
// pymdownx.highlight will be used. When this happens, the outer container
// and tables get this class names by default
.highlight {
  @extend .codehilite;

  // Inline line numbers
  [data-linenos]::before {
    position: sticky;
    left: 0;
    display: inline-block;
    margin-right: px2em(16px, 13.6px);
    color: var(--md-default-fg-color--lighter);
    box-shadow: inset px2rem(-1px) 0 var(--md-default-fg-color--lightest);
    content: attr(data-linenos);
    user-select: none;
  }
}

// Same as above, but for code blocks with line numbers enabled
.highlighttable {
  @extend .codehilitetable;
}