<!DOCTYPE html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
body, html {
    width: 100%;
    height: 100%;
    margin: 0;
}

iframe, input {
    width: 400px;
    height: 250px;
    display: block;
    font-size: 100px;
}
</style>
</head>
<body>
<input></input>
<iframe srcdoc="<a href='https://www.apple.com/' style='font-size: 100px;'>Link to apple.com</a>">
</body>