The CSS IS APPLICABLE FOR ALL CHILD THEME OF VARIA THEME. CHILD THEMES ARE SHARED AT THE BOTTOM OF THE POST
Morden is a functional and responsive multi-purpose theme that is the perfect solution for your business’s online presence. You can see Modern theme demo here. It is actually the Child theme of Varia. So, if you want to use it in your hosting, then you need to use Varia theme as Parent theme.