I can't style the clock's font size in gtkgreet for some reason. I can
change its font weight and color, but the font-size property just
doesn't work. any ideas on how to fix it? here's the clock part of my
stylesheet:

#clock {
font-size: 15; /* doesn't work for some reason */
font-weight: 900; /* works*/
color: rgba(255, 0,0,1); /* works*/
}