[IONIC 4] Scroll buttons not showing on android

I cant show the scroll buttons on android only the thump but i need to only show the buttons of the scroll. this is my scss

.div {
    overflow-y: scroll;
}

::-webkit-scrollbar {
    width: 16px !important;
    display: block;
}

::-webkit-scrollbar-button:single-button {
    background-color: #ffffff;
    display: block;
    border-style: solid;
    height: 13px;
}

::-webkit-scrollbar-button:single-button:vertical:decrement {
    display: block;
    border-width: 0 8px 8px 8px;
    border-color: transparent transparent #000000 transparent;
}

::-webkit-scrollbar-button:single-button:vertical:increment {
    display: block;
    border-width: 8px 8px 0 8px;
    border-color: #000000 transparent transparent transparent;
}