JSFiddle - React, Tailwind, and code Playground

HTML

<div id="parent">
    <div id="floatRight"></div>
    <div class="left"></div>        
    <div class="left"></div>
    <div class="left"></div>
    <div class="left"></div>
</div>

CSS

#parent {
    width:100%;
}
.left{
    width: auto;
    height:100px;
    overflow:hidden;
    border: 2px solid green;
    background: orange;
    margin:10px;
}
#floatRight {
    width: 37%;
    height:200px;
    border: 2px solid red;
    float:right;
    margin: 0px 10px;
}