JSFiddle - React, Tailwind, and code Playground

HTML

<div id="head">
    <div id="div1">див 1</div>
    <div id="div2">див 2</div>
</div>

CSS

#head {
    background: yellow; 
    width: 550px;
    overflow: auto;
}
#div1 {
    background: red;
    height: 150px; 
    width: 150px; 
    float: left;
}
#div2 {
    background: green;
    height: 150px; 
    width: 150px; 
    float: right;
}