body, .btn, .comment-form input[type=submit], .search-form .search-submit {
    font-family: 'Oswald', sans-serif;
}
h1, .h1, h2, .h2, h3, .h3, h4, .h4, h5, .h5, h6, .h6, .menu-item, .subtitle {
    font-family: 'Oswald', sans-serif;
}