scr {
  overflow: scroll;
  width: 1000px;
  height: 1000px;
  background-color: red;
}
.vsb {
  overflow: visible; 
  width: 1000px;
  height: 1000px;
  background-color: green;
}
.hdn {
  overflow: hidden; 
  width: 1000px;
  height: 1000px;
  background-color: blue;
}