How to set "proximanova" font Sugar 6 ?

Hello,

I need to "proximanova" font for all listing, edit, detail, popup page.

I have set style.css file

@font-face {

    font-family: proximanova;

    src: url(proximanova-regular-webfont.woff);

}

body {

    background:#ffffff;

    font-family: proximanova, 'Helvetica Neue', Helvetica, Arial, sans-serif;

    font-size:12px;

    margin: 0;

    overflow:auto;

    padding-top: 50px;

}

But it is not working.