openproject/app/views/timelines/_chart_container.html

 <div timeline ng-class="{timeline: true, 'tl-under-construction': underConstruction}">
  <div class="tl-left">
    <div class="tl-left-top tl-decoration"></div>
    <div class="tl-left-main">

      <timeline-table ng-hide="timeline.options.hide_chart" />

    </div>
  </div>
  <div class="tl-right">
    <div class="tl-right-top tl-decoration"></div>
    <div class="tl-right-main"></div>
  </div>
  <div class="tl-scrollcontainer">
    <!--div class="tl-decoration"></div-->
    <div class="tl-chart"></div>
  </div>
  <div class="tl-tooltip fade above in">
    <div class="tl-tooltip-inner"></div>
    <div class="tl-tooltip-arrow"></div>
  </div>
</div>