BoatAttack/Packages/com.unity.render-pipelines.core/Editor/LookDev/DisplayWindow-PersonalSkin.uss

/* ******************************* */
/* override for personal skin them */
/* ******************************* */
#environmentContainer > EnvironmentElement
{
    border-color: #999999;
}

#separator
{
    border-color: #999999;
}

.list-environment-overlay > ToolbarButton
{
    background-color: #CBCBCB;
}

#inspector-header
{
    background-color: #CBCBCB;
    border-color: #999999;
}

#separator-line
{
    background-color: #CBCBCB;
}

Image.unity-list-view__item:selected
{
    border-color: #3A72B0;
}