whisper.cat/weboasis/css/perfect-scrollbar.css

/*
 * Container style
 */
.ps {
  overflow: hidden !important;
  overflow-anchor: none;
  -ms-overflow-style: none;
  touch-action: auto;
  -ms-touch-action: auto;
}

/*
 * Scrollbar rail styles
 */

.ps__rail-x {
  display: none;
  opacity: 0;
  transition: background-color 0.2s linear, opacity 0.2s linear;
  -webkit-transition: background-color 0.2s linear, opacity 0.2s linear;
  height: 0px;
  /* there must be 'bottom' or 'top' for ps__rail-x */

  /* please don't change 'position' */
  position: absolute;
}

.ps__rail-y {
  display: none;
  opacity: 0;
  transition: background-color 0.2s linear, opacity 0.2s linear;
  -webkit-transition: background-color 0.2s linear, opacity 0.2s linear;
  width: 8px;
  /* there must be 'right' or 'left' for ps__rail-y */
  right: 0px;
  /* please don't change 'position' */
  position: absolute;
}

.menu-link .ps__rail-y {
  display: none;
  opacity: 0;
  transition: background-color 0.2s linear, opacity 0.2s linear;
  -webkit-transition: background-color 0.2s linear, opacity 0.2s linear;
  width: 8px;
  /* there must be 'right' or 'left' for ps__rail-y */
  right: 170px;
  /* please don't change 'position' */
  position: absolute;
}

.ps--active-x > .ps__rail-x,
.ps--active-y > .ps__rail-y {
  display: block;
  background-color: transparent;
}

.ps:hover > .ps__rail-x,
.ps:hover > .ps__rail-y,
.ps--focus > .ps__rail-x,
.ps--focus > .ps__rail-y,
.ps--scrolling-x > .ps__rail-x,
.ps--scrolling-y > .ps__rail-y {
  opacity: 0.9;
}

.ps .ps__rail-x:hover,
.ps .ps__rail-y:hover,
.ps .ps__rail-x:focus,
.ps .ps__rail-y:focus,
.ps .ps__rail-x.ps--clicking,
.ps .ps__rail-y.ps--clicking {
  /* background-color: #eee; */
  background-color: #24272a;
  opacity: 1;
}

/*
 * Scrollbar thumb styles
 */
.ps__thumb-x {
  background-color: #444444;
  border-radius: 6px;
  transition: background-color 0.2s linear, height 0.2s ease-in-out;
  -webkit-transition: background-color 0.2s linear, height 0.2s ease-in-out;
  height: 8px;
  /* there must be 'bottom' for ps__thumb-x */
  bottom: 2px;
  /* please don't change 'position' */
  position: absolute;
}

.ps__thumb-y {
  /* background-color: #aaa; */
  background-color: #444444;
  border-radius: 6px;
  transition: background-color 0.2s linear, width 0.2s ease-in-out;
  -webkit-transition: background-color 0.2s linear, width 0.2s ease-in-out;
  width: 8px;
  /* there must be 'right' for ps__thumb-y */
  right: 0;
  /* please don't change 'position' */
  position: absolute;
}

.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; */
  background-color: #aaa;
  height: 11px;
}

.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; */
  background-color: #aaa;
  width: 8px;
}

/* MS supports */
@supports (-ms-overflow-style: none) {
  .ps {
    overflow: auto !important;
  }
}

@media screen and (-ms-high-contrast: active), (-ms-high-contrast: none) {
  .ps {
    overflow: auto !important;
  }
}