.container{
  width: 200px;
  height: 200px;
  background: #eee;
  overflow: auto;
  resize: both;
}
.box{
  width: 100px;
  height: 500px;
  background: pink;
}
.container::-webkit-scrollbar {
  width: 1em;
}
.container::-webkit-scrollbar-button{
  background: #fff;
}
.container::-webkit-scrollbar-track-piece{
  background: #aaa;
}
 
.container::::-webkit-scrollbar-corner{
  border:1px solid red;
}
.container::-webkit-scrollbar-track {
  box-shadow: inset 0 0 6px rgba(0, 0, 0, 0.3);
}
 
.container::-webkit-scrollbar-thumb {
  background-color: white;
  border: 1px solid slategrey;
}