This is the first entry:

.ms-container h1, .ms-container h2, .ms-container h3, .ms-container h4, .ms-container h5,
.ms-container h6, .ms-h1, .ms-h2, .ms-h3, .ms-h4, .ms-h5, .ms-h6, html, body, div, span,
applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address,
big, cite, code, del, dfn, em, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt,
var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, caption, article,
aside, canvas, details, embed, figure, figcaption, footer, header, hgroup, menu, nav, output,
ruby, section, summary, time, mark, audio, video {
    font-family: "Helvetica Neue",Helvetica,Arial,sans-serif;
}

It interferes with the font-family of the Porto menu. Just an FYI.