Assalamualaikum and annyeonghaseyo.

1.Dashboard > Template > Edit HTML
2.Press Ctrl+f serentak dan cari code ni blockquote {
3.Copy code dkt bawah ni

::-webkit-scrollbar {
height: 12px;
width: 12px;
background-color: #FFFFFF;
}
::-webkit-scrollbar-thumb {
background-color: #A4A4A4;
-moz-border-radius: 10px;
border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
background-color: #000000;
-moz-border-radius: 10px;
border-radius: 10px;
}