district base

Example
Markup
 <div class="block-views-exposed-filter-blocksearch-sitewide-search">
 <form>
   <div class="form--inline clearfix">
     <div class="js-form-item form-item js-form-type-textfield form-type-textfield js-form-item-keywords form-item-keywords">
       <label for="edit-keywords">Keywords</label>
       <input placeholder="Find a service, event or general info" type="text" class="form-text">
     </div>
     <div class="form-actions js-form-wrapper form-wrapper">
       <input type="submit"value="Search" class="button js-form-submit form-submit">
     </div>
   </div>
 </form>
 </div>
Source: docroot/themes/contrib/district_base/styles/scss/components/_search.scss, line 5