How to apply desktop theme to VLC, Virtualbox etc.?

[Aragorn]

Welcome to the forum!

@fahrer17

Is there a way I can theme VLC player and Virtualbox according to the theme I use (I know I can skin VLC)?

[…]

For testing purposes I installed an vanilla Manjaro XFCE and changed the theme colors from Manjaro green to Matcha azul and even there VLC doesn’t work as expected.

VLC and VirtualBox are Qt-based applications, while XFCE is based upon the GTK widget toolkit.

Make sure that you have qt5ct and kvantum-qt5 installed ─ they’re both in the main repository if they’re not on your system already ─and then you can tweak the look & feel of Qt-based applications.

kvantum-qt5 ─ listed in your menu as Kvantum Manager ─ is a theme engine based upon scalable vector graphics, in which you can load special Kvantum themes. There are several such themes in the repository, such as kvantum-matcha, and others can be downloaded from store.kde.org.

Hope this helps.