1<?xml version="1.0" encoding="UTF-8"?>
2<!--
3     Any copyright is dedicated to the Public Domain.
4     http://creativecommons.org/publicdomain/zero/1.0/
5-->
6<html xmlns="http://www.w3.org/1999/xhtml">
7  <head>
8    <style>
9      #container {
10        display: flex;
11        width: 100px;
12        height: 100px;
13        background: lime;
14      }
15    </style>
16  </head>
17  <body>
18    <div id="container"></div>
19  </body>
20</html>
21