JSFiddle - React, Tailwind, and code Playground

HTML

<div id="blockContainer">
    <div id="right">World</div>
    <div id="left">Hello</div>
</div>

CSS

#blockContainer > div {
    border: 1px dashed #f0f
}

#blockContainer {
    display: -webkit-box;
    display: -moz-box;
    display: box;
    
    -webkit-box-orient: vertical;
    -moz-box-orient: vertical;
    box-orient: vertical;
}
#right {
    -webkit-box-ordinal-group: 2;
    -moz-box-ordinal-group: 2;
    box-ordinal-group: 2;
}
#left {
    -webkit-box-ordinal-group: 3;
    -moz-box-ordinal-group: 3;
    box-ordinal-group: 3;
}