:root {
    font-family: InterVariable, sans-serif;
    font-synthesis: none;
    font-size: 18px;
    font-feature-settings:
        "liga" 1,
        "calt" 1;
}

body {
    margin: 40px auto;
    max-width: 650px;
    line-height: 1.6;
    font-size: 18px;
    color: #444;
    padding: 0 10px;
}
h1,
h2,
h3 {
    line-height: 1.2;
}