mkdocs-material/material/partials/search.html

<div class="md-search">
  <div class="md-search__overlay"></div>
  <div class="md-search__inner">
    <form class="md-search__form">
      <input type="text" class="md-search__input" placeholder="Search" autocapitalize="off" autocorrect="off" autocomplete="off" spellcheck="false" id="query">
      <label class="md-icon md-search__icon" for="search"></label>
    </form>
    <div class="md-search__output">
      <div class="md-search__scrollwrap">
        <div class="md-search-result">
          <div class="md-search-result__meta">
            Type to search...
          </div>
          <ol class="md-search-result__list"></ol>
        </div>
      </div>
    </div>
  </div>
</div>