<!DOCTYPE html>
<style>
#flexbox {
width: 500px;
display: flex;
direction: rtl;
}
#redbox {
background: red;
flex: 1;
}
#greenbox {
background: green;
flex: 1;
}
</style>
<p>There should be a green box followed by a red box, both on the same line.
<div id="flexbox">
<div id="redbox">A</div>
<div id="greenbox">B</div>
</div>