JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
    <head>
        <title>
            Задание 3. Блок с градиентом
        </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>
            <section>
                <h1>
                    Заголовок
                    <i></i>
                </h1>
                <p>
                    Содержимое
                </p>
            </section>
        </div>
    </body>
</html>

CSS

*
{
    margin: 0;
    padding: 0;
    font-size: 100%;
}
html
{
    font: 125% arial, sans-serif;
    background: url(http://scrapmania.ru/images/1220148.jpg);
}
body
{
    font-size: 50%; /* 10px */
    padding: 10px;
}
div,
section
{
    border-radius: 5px;
}
div
{
    border: 2px solid #003C2A;
    background: -moz-linear-gradient(top, rgba(103, 212, 187, 0.5), rgba(92, 165, 149, 0.5));
    background: -webkit-gradient(linear, left top, left bottom, from(rgba(103, 212, 187, 0.5)), to(rgba(92, 165, 149, 0.5)));
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='rgba(103, 212, 187, 0.5)', endColorstr='rgba(92, 165, 149, 0.5)');
    padding: 8px;
}
section
{
    display: block;
    min-height: 100px;
    background-color: #FFFFFF;
    border: 1px solid #003C2A;
}
h1
{
    background-color: #FFC400;
    font: 1.8em normal;
    border-radius: 5px 5px 0 0;
    position: relative;
    padding: 6px 10px;
}
h1 i
{
    display: block;
    position: absolute;
    left: 6px;
    bottom: -10px;
    border-color: #FFC400 transparent transparent transparent;
    border-style: solid;
    border-width: 10px 10px 0 10px;
    height: 0px;
    width: 0px;
}
p
{
    font-size: 1.4em;
    padding: 12px 10px 6px;
}