A standard scroll bar is located in the nonclient area of a window. It is created with the window and displayed when the window is displayed. In this tutorial, you will learn how to use CSS to customize scrollbars to support modern browsers.
Add This Code in Style.css file
::-webkit-scrollbar {
width: 12px;
}
::-webkit-scrollbar-track {
-webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.3);
border-radius: 10px;
}
::-webkit-scrollbar-thumb {
border-radius: 10px;
-webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.5);
}The Different Pieces
These are the pseudo-elements themselves. The actual parts of the scrollbars.
::-webkit-scrollbar { /* 1 */ }
::-webkit-scrollbar-button { /* 2 */ }
::-webkit-scrollbar-track { /* 3 */ }
::-webkit-scrollbar-track-piece { /* 4 */ }
::-webkit-scrollbar-thumb { /* 5 */ }
::-webkit-scrollbar-corner { /* 6 */ }
::-webkit-resizer 
