Changing the color of the dashed line on the left side when a tree component is expanded

[VanessaRLewis]

The dashed line on the left side of the tree remains white while I can change colors of the svgs with 'fill'. I added the following to a css file but neither worked:

.treeview > .contents {
  border-left: '1px dashed rgba(0,255,0,0.4)',
}

.contents {
  border-left: '1px dashed rgba(0,255,0,0.4)',
}

[soer7022]

This can be done like this:
.treeview { > div { border-left: 1px solid black !important; } }

[branflake2267]

It can also be done like this:

.treeview > div { 
  border-left: 1px dashed black !important; 
}