teste-conhecimento-19.html

<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="content-type" content="text/html; charset=UTF-8">
        <meta charset="utf-8">
        <title>Desafio</title>

        <style rel="stylesheet">
            div {
                background: blue;
                border-radius: 50%;
                left: 100px;
                height: 200px;
                position: absolute;
                top: 100px;
                width: 200px;
            }
            div>div {
                background: red;
                left:-20px;
                height: 240px;
                opacity:0.85;
                position: absolute;
                top:-20px;
                width: 240px;
                z-index: -1;
            }
        </style>
    </head>
    <body>
        <div>
            <div></div>
        </div>
    </body>
</html>