scrollbars.css

/* Variables */
:root {
  --scrollbar-size: .375rem;
  --scrollbar-minlength: 1.5rem; /* Minimum length of scrollbar thumb (width of horizontal, height of vertical) */
  --scrollbar-ff-width: thin; /* FF-only accepts auto, thin, none */
  --scrollbar-track-color: transparent;
  --scrollbar-color: rgba(0,0,0,.2);
  --scrollbar-color-hover: rgba(0,0,0,.3);
  --scrollbar-color-active: rgb(0,0,0);
}

/* Use .layout-scrollbar-obtrusive to only use overflow if scrollbars don’t overlay */
.scrollbar-test,
.layout-cell {
  overscroll-behavior: contain;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  -ms-overflow-style: -ms-autohiding-scrollbar;
  scrollbar-width: var(--scrollbar-ff-width);
}

/* This class controls what elements have the new fancy scrollbar CSS */
.layout-scrollbar {
  scrollbar-color: var(--scrollbar-color) var(--scrollbar-track-color);
}
/* Only apply height/width to ::-webkit-scrollbar if is obtrusive */
.layout-scrollbar-obtrusive .layout-scrollbar::-webkit-scrollbar {
  height: var(--scrollbar-size);
  width: var(--scrollbar-size);
}
.layout-scrollbar::-webkit-scrollbar-track {
  background-color: var(--scrollbar-track-color);
}
.layout-scrollbar::-webkit-scrollbar-thumb {
  background-color: var(--scrollbar-color);
  border-radius: 3px;
}
.layout-scrollbar::-webkit-scrollbar-thumb:hover {
  background-color: var(--scrollbar-color-hover);
}
.layout-scrollbar::-webkit-scrollbar-thumb:active {
  background-color: var(--scrollbar-color-active);
}
.scrollbar-test::-webkit-scrollbar-thumb:vertical,
.layout-scrollbar::-webkit-scrollbar-thumb:vertical {
  min-height: var(--scrollbar-minlength);
}
.scrollbar-test::-webkit-scrollbar-thumb:horizontal,
.layout-scrollbar::-webkit-scrollbar-thumb:horizontal {
  min-width: var(--scrollbar-minlength);
}


@media (prefers-color-scheme: dark) {
  :root {
    --scrollbar-color:#555;
    --scrollbar-color-hover: #555;
    --scrollbar-color-active: #555;
  }
}