Aşağıdaki Kodları Global.css En Alta Ekleyin.

Kod:

::-webkit-scrollbar {
    width: 12px;
}
::-webkit-scrollbar-track {
    border-left: 1px solid #000;

}
::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.85);
    -webkit-box-shadow: inset 0 0 6px rgba(0, 0, 0, 0.27);
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.93);
    -webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.5);
}
::-webkit-scrollbar-thumb:window-inactive {
    background: rgba(0,0,0,0.6);
}
@-webkit-keyframes headershine {
    0%        { opacity: 0.4; }
    50%        { opacity: 1; }
    100%     { opacity: 0.4; }
}