Pytop/src/versions/pytop-0.0.1/Pytop/resources/stylesheet.css

viewport,
treeview,
treeview > header,
notebook > stack,
notebook > header {
    background-color: rgba(0, 0, 0, 0.24);
}


notebook > header {
    background-color: rgba(0, 0, 0, 0.24);
    border-color: rgba(0, 232, 255, 0.64);
}