@font-face {
    font-family: 'Helvetica';
    src: url('Helvetica.eot');
    src: url('Helvetica.eot') format('embedded-opentype'),
         url('Helvetica.woff2') format('woff2'),
         url('Helvetica.woff') format('woff'),
         url('Helvetica.ttf') format('truetype'),
         url('Helvetica.svg#Helvetica') format('svg');
}