JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
    <head>
        <title>
            Задание 1. Эскиз
        </title>
        <link type = "text/css" rel = "stylesheet" href = "style.css">
        <!--[if IE]>
            <script src = "http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
        <![endif]-->
    </head>
    <body>
        <div>
            Рабочий эскиз
            <i id="angel1"></i>
            <i id="angel2"></i>
            <i id="angel3"></i>
            <i id="angel4"></i>
        </div>
    </body>
</html>

CSS

*
{
    margin: 0;
    padding: 0;
    font-size: 100%;
}
html,
body
{
    padding: 20px;
}
html
{
    font: 125% georgia, serif;
}
body
{
    font-size: 50%; /* 10px */
    position: relative;
}
div
{
    background-color: #F0F0F0;
    padding: 10px;
    font-size: 1.6em;
    border: 1px solid;
}
i
{
    position: absolute;
    display: block;
    width: 20px;
    height: 20px;
}
i#angel1
{
    top: 0;
    left: 0;
    border-bottom: 1px solid;
    border-right: 1px solid;
}
i#angel2
{
    top: 0;
    right: 0;
    border-bottom: 1px solid;
    border-left: 1px solid;
}
i#angel3
{
    bottom: 0;
    left: 0;
    border-top: 1px solid;
    border-right: 1px solid;
}
i#angel4
{
    bottom: 0;
    right: 0;
    border-top: 1px solid;
    border-left: 1px solid;
}