html,
body {
    font-size: 18px;
    font-family: 'PT Serif', serif;
    padding: 0;
    margin: 0;

    @media (max-width: 839px) {
        font-size: 16px;
    }

    @media (max-width: 480px) {
        margin: {
            left: 15px;
            right: 15px;
        }
    }
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: normal;
}