Font

Global style font:
https://fonts.googleapis.com/css?family=Source+Sans+Pro:300,400,500,600,700
Only import latin 300, 400, 600, 700.
Userstyles does not allow @import on their site. @import should work everywhere else.
@import url(//fonts.googleapis.com/css?family=Source+Sans+Pro:300,400,500,600,700)

/* latin */
@font-face {
    font-family: 'Source Sans Pro';
    font-style: normal;
    font-weight: 300;
    src: url(https://fonts.gstatic.com/s/sourcesanspro/v18/6xKydSBYKcSV-LCoeQqfX1RYOo3ik4zwlxdu.woff2) format('woff2');
    unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
/* latin */
@font-face {
    font-family: 'Source Sans Pro';
    font-style: normal;
    font-weight: 400;
    src: url(https://fonts.gstatic.com/s/sourcesanspro/v18/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7l.woff2) format('woff2');
    unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
/* latin */
@font-face {
    font-family: 'Source Sans Pro';
    font-style: normal;
    font-weight: 600;
    src: url(https://fonts.gstatic.com/s/sourcesanspro/v18/6xKydSBYKcSV-LCoeQqfX1RYOo3i54rwlxdu.woff2) format('woff2');
    unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
/* latin */
@font-face {
    font-family: 'Source Sans Pro';
    font-style: normal;
    font-weight: 700;
    src: url(https://fonts.gstatic.com/s/sourcesanspro/v18/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu.woff2) format('woff2');
    unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}