perfect-scrollbar.js : The MIT License (MIT) Copyright (c) 2012-2017 Hyunje Jun and other contributors.
,CZX,Download 
https://github.com/mdbootstrap/perfect-scrollbar/tree/0.8.1

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jQuery͂ȂĂ̂Ŗgp

<Div id="Historybox" style="position:relative;"></div>
#Historybox { position:relative; }
<script>var ps = new PerfectScrollbar('#Historybox');</script>
܂,IvV𓧂ꍇ
<script>var ps = new PerfectScrollbar('#Historybox',{ maxScrollbarLength:30 });</script>

IvV:Options

handlers           :XN[nhwB ['click-rail','drag-thumb','keyboard','wheel','touch'](l)  
                    ) var ps = new PerfectScrollbar('#sample', {handlers: ['keyboard']});
wheelSpeed         :}EXzC[ł̃XN[xBl:1
minScrollbarLength :XN[o[̍ŏlw l:true
maxScrollbarLength :XN[o[̍őlw l:true
scrollingThreshold :XN[vf}EXAEg,XN[o[\ɂȂ܂ł̎Ԃ~bŎw l:1000
suppressScrollX    :X̃XN[o[gpłȂ l:false
suppressScrollY    :ỸXN[o[gpłȂ l:false
scrollXMarginOffset:XN[vf̒g̕,X̃XN[o[LɂȂŃXN[vf̕𒴂邱Ƃł͈ l0
scrollYMarginOffset:XN[vf̒g̍,ỸXN[o[LɂȂŃXN[vf̍𒴂邱Ƃł͈ l0
ɂ邪pbP[WhLgQƁB

Cxg:Events
var container = document.querySelector('#CONPLIST');
var ps = new PerfectScrollbar(container);
    container.addEventListener('ps-scroll-y', function() { console.log('ps-scroll-y', ps.reach.x, ps.reach.y); });  Listener

Events
ps-scroll-y:YɃXN[ꂽ
ps-scroll-x:XɃXN[ꂽ
ps-scroll-up:ɃXN[ꂽ
ps-scroll-down:ɃXN[ꂽ
ps-scroll-left:ɃXN[ꂽ
ps-scroll-right:EɃXN[ꂽ

ȉ style(css)width/height̎wɂ܂AElementŎgpƂBodyƂ̊֌Wō\IɔȂꍇ蓾B
ps-y-reach-start:XN[Y̊JnʒuɒB
ps-y-reach-end  :XN[Y̏IʒuɒB
ps-x-reach-start:XN[X̊JnʒuɒB
ps-x-reach-end  :XN[X̏IʒuɒB

css:style(Qly[WQ)
ݒƂ
ɃXN[o[\
.ps__rail-x { height: 10px; }
.ps__rail-y { width: 10px;  }

Oς̕ω}~
.ps__rail-x:hover > .ps__thumb-x,
.ps__rail-x:focus > .ps__thumb-x,
.ps__rail-x.ps--clicking .ps__thumb-x { background-color: #999;height: 6px; }
.ps__rail-y:hover > .ps__thumb-y,
.ps__rail-y:focus > .ps__thumb-y,
.ps__rail-y.ps--clicking .ps__thumb-y { background-color: #999; width: 6px; }

Ql
http://cly7796.net/wp/javascript/plugin-perfect-scrollbar/
https://webkcampus.com/201903/1578/
https://freefielder.jp/blog/2018/06/scrollbar-without-jquery.html 
