mkdocs-material/src/assets/stylesheets/layout/_sidebar.scss

/*
 * Copyright (c) 2016 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
 * IN THE SOFTWARE.
 */

/* ----------------------------------------------------------------------------
 * Sidebar
 * ------------------------------------------------------------------------- */

/*
 * Sidebar content
 */
.md-sidebar {
  position: relative;
  width: 24.2rem;
  float: left;
  overflow: visible;

  /*
   * Lock sidebar to container height (account for fixed header)
   */
  &.md-js__sidebar--locked {
    position: fixed;
    top: 5.6rem;
  }

  /* [tablet landscape -]: Convert navigation to drawer */
  @include break-to-device(tablet landscape) {

    /*
     * Render primary sidebar as a slideout container
     */
    &--primary {
      position: fixed;
      top: 0;
      width: 24.2em;
      height: 100%;
      z-index: 3;
      background: $md-color-white;
      transition: transform .25s cubic-bezier(0.4, 0.0, 0.2, 1.0);
      transform: translate3d(-24.2em, 0, 0);

      /*
       * Just hide drawer, if browser doesn't support 3D transforms
       */
      .no-csstransforms3d & {
        display: none;
      }

      /*
       * Expanded drawer
       */
      #md-toggle-drawer:checked ~ .md-container & {
        transform: translate3d(0, 0, 0);

        /*
         * Just show drawer, if browser doesn't support 3D transforms
         */
        .no-csstransforms3d & {
          display: block;
        }
      }
    }
  }

  /*
   * Secondary sidebar with table of contents
   */
  &--secondary {
    display: none;

    /* [tablet landscape +]: Show table of contents next to body copy */
    @include break-from-device(tablet landscape) {
      display: block;
      float: right;

      /*
       * Hack to align right in case of locked sidebar
       */
      &.md-js__sidebar--locked {
        margin-left: 100%;
        transform: translate(-100%, 0);

        /* [screen small +]: Limit to grid */
        @include break-from-device(screen small) {
          margin-left: 120.0rem;
        }
      }
    }
  }

  /*
   * Wrapper for scrolling on overflow
   */
  &__scrollwrap {
    margin: 2.4rem 0.4rem;
    overflow-y: scroll;
    -webkit-overflow-scrolling: touch;

    /* [tablet landscape -]: Adjust margins */
    @include break-to-device(tablet landscape) {

      /*
       * Adjust margins for primary scrollbar
       */
      .md-sidebar--primary & {
        margin: 0;
      }
    }

    /*
     * Limit height to window, if JavaScript is available
     */
    .js & {
      position: absolute;
      top: 0;
      left: 0;
      bottom: 0;
      right: 0;
    }

    /*
     * Override native scrollbar styles
     */
    &::-webkit-scrollbar {
      width: 0.4rem;
      height: 0.4rem;

      /*
       * Style scrollbar thumb
       */
      &-thumb {
        background: $md-color-black--lighter;
      }
    }
  }

  /*
   * Actual sidebar content
   */
  &__inner {
    padding: 1.2rem;

    /* [screen small +]: Add line for reference */
    @include break-from-device(screen small) {
      border-right: px2rem(1px) solid $md-color-black--lightest;
    }
  }
}