Indicator when div has scrollbar

HTML

<div class="article">
  <div class="section">
    <div class="inner">
      ABCDEFG HIJKLMN OPQRSTUVWXYZ ABCDEFGH IJKLMNOPQ RSTUVWXYZ
    </div>
    <div class="indicator"></div>
    </div>
    This one has a long line of text so it has scrollbars and should have the red indicator
  </div>
  
  </div>
<div class="article">
  <div class="section">
    <div class="inner">
      ABCDEF
    </div>
    <div class="indicator"></div>
  </div>
  This one is short, no scrollbars, should NOT have the indicator
</div>
<div class="article">
  <div class="section">
    <div class="inner">
      ABCDEFG HIJKLMN OPQRSTU VWXYZ 
    </div>
    <div class="indicator"></div>
  </div>
  This one has a long line of text so it has scrollbars and should have the red indicator
</div>

CSS

.article {
  background: silver;
  width: 30%;
  display: inline-block;
}
.section {
  width: 100%;
  height: 100px;
  overflow: hidden;
  position: relative;
}
.inner {
  width: auto;
  overflow-x: auto;
  white-space: nowrap;
}
.indicator {
  width: 20px;
  height: 20px;
  background: red;
  position: absolute;
  top: 0;
  right: 0;
}