<!DOCTYPE html>
<style>
    .container {
        color: black;
        font: 20vw/1 Ahem;
    }
    .float {
        width: 20vw;
        height: 40vw;
        float: left;
        background-color: grey;
    }
</style>
<body>
    <div class="container">
        <div class="float"></div>
        X<br/>
        X
    </div>
</body>