@font-face {
    font-family: 'Cairo';
    src: url('Cairo/Cairo-VariableFont_slnt,wght.ttf'), /* Chrome 6+, Firefox 3.6+, IE 9+, Safari 5.1+ */
    url('Cairo/Cairo-VariableFont_slnt,wght.ttf'); /* Chrome 4+, Firefox 3.5, Opera 10+, Safari 3—5 */
}

body {
    font-family: 'Cairo';
}