I'm having difficulty using font variants in my CSS file and having it reflected in Scene Builder.

In my example, I'm using the 'Source Sans Pro' font. If I create a label and assign it a CSS style:

.normal-label-bold {
    -fx-font-family: 'Source Sans Pro';
    -fx-font-size: 1.1em;
}

it works OK. If I try to use a 'Light' variant of the font:

.normal-label {
    -fx-font-family: 'Source Sans Pro Light';
    -fx-font-size: 1.1em;
}

this doesn't work. It shows the default System font.

However, if I give the Label two styles: normal-label AND normal-label-bold, then the Light font shows correctly. I've also been able to get it to show correctly by fooling around with the Font and Style Class properties but I can't reproduce it reliably.