Third Party Apps has a WIndows 98 Look

If you install an application it has a Windows 98 look and upon some searching I found out it’s because there are no Default themes GTK 2/3 in Ubuntu DDE

Ubuntu DDE should add some Default themes GTK 2/3 for the third party apps so it wont have that windows 98 look

Hey there,
Which app is it to be specific that is showing as Windows 98 look?
And yes, UbuntuDDE Remix has preinstalled Deepin GTK theme for the support of gtk apps.

The .themes folder is empty and gnome shell extensions shows adwaita theme as default and I can’t select anything else

Any gtk app I tried had that look