body.f-compactmode {
    font-size: 13px !important;
}

    body.f-compactmode input, body.f-compactmode textarea, body.f-compactmode select, body.f-compactmode button {
        font-size: 13px !important;
    }

body.f-smallmode {
    font-size: 12px !important;
}

    body.f-smallmode input, body.f-smallmode textarea, body.f-smallmode select, body.f-smallmode button {
        font-size: 12px !important;
    }