.solid-scrollbar {
  background-color: #f8f9fa;
  overflow: auto;
}

/* scrollbar */
.solid-scrollbar::-webkit-scrollbar {
  width: 12px;
  height: 12px;
}

/* track (THIS is the background you want) */
.solid-scrollbar::-webkit-scrollbar-track {
  background: #e9ecef;
}

/* thumb */
.solid-scrollbar::-webkit-scrollbar-thumb {
  background: #adb5bd;
  border-radius: 6px;
}