Why does the category hover state not appear but the link hover state does?
The selector is at line 23 https://code.sololearn.com/WxF41f64Dx0i/?ref=app
It works depending on your browser. Since you're using the app it will only show hover when you press your finger on it. If you are are viewing from a desktop browser then hover shows while the courser is moving over it.
change background color to any other and see. edit: it's working. violet to red or blue and see?