<!DOCTYPE html>
<body>
<div style="writing-mode: vertical-lr;
            height: 300px;
            font-size: 0;
            line-height: 0;
            border: 1px solid gray;
            overflow: scroll;
            direction: rtl;">
  <div style="height: 100%;
              width: 100px;
              border: 50px solid blue;">