Nexus/Library/PackageCache/com.unity.render-pipelines.universal@ec76624224b1/Editor/Converter/converter_editor.uss

.iconButton {
    background-color: rgba(0,0,0,0);
}

.light :hover {
    background-color: #B2B2B2;
}

.dark :hover {
    background-color: #303030;
}