css beutify scroller

1body::-webkit-scrollbar {
2  width: 1em;
3}
4 
5body::-webkit-scrollbar-track {
6  box-shadow: inset 0 0 6px rgba(0, 0, 0, 0.3);
7}
8 
9body::-webkit-scrollbar-thumb {
10  background-color: darkgrey;
11  outline: 1px solid slategrey;
12}