JSFiddle - React, Tailwind, and code Playground

HTML

<div id='wrapper'>
    <div id='box'></div>
    <div contenteditable='true' id='edit'>
        Welcome to the box.
    </div>
</div>

CSS

#box {
    background-color : orange;
    width : 100px;
    height : 100px;
    float : left;
    margin : 0 10px 10px 0;
}
#wrapper {
    border : 1px solid red;
    padding : 10px;
}
#edit {
    height : 300px;
}