<div class="container">
    <span class="text">
        80 x 40 pixels
    </span>
</div>
html {
    padding: 20px;
}

.container {
    font-size: 40px;
    width: 2em;
    height: 1em;
    background: #eee;
}
.container > .text {
    display: block;
    font-size: 20px;
    line-height: 1;
}
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