::-webkit-scrollbar

webkit-scrollbar.css

/* Webkit
https://jsfiddle.net/oj5x30gx/1/
-------------------------------------------------- */
/* Turn on a 13x13 scrollbar */
::-webkit-scrollbar {
    width: 13px;
    height: 13px;
}
::-webkit-scrollbar-button:vertical {
    background-color: red;
}
/* Turn on single button up on top, and down on bottom */
::-webkit-scrollbar-button:start:decrement,
::-webkit-scrollbar-button:end:increment {
    display: block;
}

/* Turn off the down area up on top, and up area on bottom */
::-webkit-scrollbar-button:vertical:start:increment,
::-webkit-scrollbar-button:vertical:end:decrement {
    display: none;
}
/* Place The scroll down button at the bottom */
::-webkit-scrollbar-button:vertical:increment {
    background-color: limegreen;
    pointer-events: none;
}
/* Place The scroll up button at the up */
::-webkit-scrollbar-button:vertical:decrement {
    background-color: gold;
    pointer-events: none;
}
::-webkit-scrollbar-track:vertical {
    background-color: pink;
}
/* Top area above thumb and below up button */
::-webkit-scrollbar-track-piece:vertical:start {
    border: 3px dashed blue;
}

/* Bottom area below thumb and down button */
::-webkit-scrollbar-track-piece:vertical:end {
    border: 3px dashed magenta;
}
/* Track below and above */
::-webkit-scrollbar-track-piece {
    background-color: skyblue;
}
/* The thumb itself */
::-webkit-scrollbar-thumb:vertical {
    background-color: tomato;
    pointer-events: none;
}
/* Corner */
::-webkit-scrollbar-corner:vertical {
    background-color: black;
}
/* Resizer */
::-webkit-scrollbar-resizer:vertical {
    background-color: gray;
}