mkdocs-material/src/assets/stylesheets/layout/_header.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
////

/// ---------------------------------------------------------------------------
/// Header
/// ---------------------------------------------------------------------------

/// Application header (stays always on top)
.md-header {
  @include z-depth(2);

  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  height: 5.6rem;
  background: $md-color-primary;
  color: $md-color-white;
  z-index: 1;

  /// Navigation within header
  &-nav {
    padding: 0.4rem;

    /// Header icon
    &__icon {
      display: inline-block;
      position: relative;
      margin: 0.4rem;
      padding: 0.8rem;
      transition: background 0.25s;
      border-radius: 100%;
      font-size: 2.4rem;
      cursor: pointer;
      z-index: 1;

      /// Pushed/clicked icon
      &:active {
        background: $md-color-white--lightest;
      }

      /// [tablet +]: Hide the search icon from tablet
      @include break-from-device(tablet) {

        /// Search icon
        &.md-icon--search {
          display: none;
        }
      }
    }

    /// Header title
    &__title {
      padding: 0 2.0rem;
      font-size: 1.8rem;
      line-height: 4.8rem;
    }
  }
}