Overflow bug

by sectioni

HTML

<div class="container">
  blablablablablablablabla
</div>

CSS

.container {
  font-family: arial;
  font-size: 15px;
  float: left;
  width: 160px;
  overflow: auto;
  border: solid 1px red;
  height: 100px;
  padding-right: 10px;
  box-sizing: contant-box;
  position: relative;
}

.container:after {
  content: "";
  display: block;
  position: absolute;
  right: 10px;
  width: 10px;
  height: 1px;
}