JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
    <head>
        <title>google</title>
    </head>
    <body>
        <div id="iframe_container">
            <iframe name="sframe" id="sframe" src="http://google.com"></iframe>
        </div>
        <div>информация</div>
    </body>
</html>

CSS

html, body {
    margin: 0;
    padding: 0;
    height: 100%;
}

body {
    position: relative;
}

#iframe_container {
    position: absolute;
    top: 0;
    bottom: 100px;
    left: 0;
    right: 0;
}

iframe {
    border:none;
    margin: 0;
    padding: 0;
    overflow:auto;
    width: 100%;
    height: 100%;
}

#iframe_container + div {
    background-color:#72a4d3;
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height:100px;
    text-align:center;
}