JSFiddle - React, Tailwind, and code Playground

HTML

<div>1</div>
<div>2</div>
<div>3</div>

CSS

* {
    margin: 0;
    padding: 0;
}
div {
    width: 100px;
    height: 100px;
    border: 1px solid black;
    border-radius: 100%;
    line-height: 100px;
    text-align: center;
    float: left;
    margin-right: 20px;
}
div:not(:last-child)::after {
    content: "";
    display: block;
    position: absolute;
    background: black;
    width: 20px;
    height: 1px;
    margin-top: -50px;
    margin-left: 100px;
}