How to disable autodesk-forge mouseHover on panel

Question

I'm trying to add some CSS on a forge panel.
Whenever I put my mouse hover a forge panel the colour of the background become darker.

Is it possible to disable this behaviour?
Edited:

Here picture of my problem

My mouse was hover the panel titled 2.

I want the background to stay like the panel 1.

Answer 1

I supposed that you want to change the background color of the tree nodes of the model structure panel or property panel while mouse hovering. Please place this CSS snippet after viewer's stylesheet:

// Change background color to red color in dark-theme
.adsk-viewing-viewer.dark-theme .treeview .group>lmvheader:hover,
.adsk-viewing-viewer.dark-theme .treeview .leaf>lmvheader:hover,
.adsk-viewing-viewer.dark-theme .treeview group>lmvheader:hover,
.adsk-viewing-viewer.dark-theme .treeview leaf>lmvheader:hover {
    background: rgba(255,0,0,.4)!important;
}

// Change background color to red color in light-theme
.adsk-viewing-viewer.light-theme .treeview .group>lmvheader:hover,
.adsk-viewing-viewer.light-theme .treeview .leaf>lmvheader:hover,
.adsk-viewing-viewer.light-theme .treeview group>lmvheader:hover,
.adsk-viewing-viewer.light-theme .treeview leaf>lmvheader:hover {
    background: rgba(255,0,0,.4)!important;
} 

And here you go!

Answer 2

This problem doesn't appear in the last version of the forge viewer. I'm gooing to upgrade my viewer