Show horizontal scroll bar on ios

I want to show a scroll bar at all times on ios devices. using this css below works vertically but not horizontally, anyone know how?

::-webkit-scrollbar {
    -webkit-appearance: none;
    width: 7px;
}
::-webkit-scrollbar-thumb {
    border-radius: 7px;
    background-color: #d6d6d6;
    -webkit-box-shadow: 0 0 1px rgba(255,255,255,.5);
    display: block;
}

::-webkit-scrollbar-track {
    border-radius: 7px;
    -webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.2); 
}