.child-container {
  background-color: pink;
  border: 2px solid white;
  height: 100px;
}
.main-container {
  display: flex;
  justify-content: space-around;
  height: 100%;
}
.div-columns {
  height: 100%;
  width: 100%;
  border: 3px solid black;
  overflow-y: auto;
}
.column-1 {
  width: 15%;
  /* overflow-y: auto; */
}
.column-2 {
  width: 35%;
}
.column-3 {
  width: 50%;
  display: flex;
}
.special-child-container1 {
  width: 30%;
  height: 100%;
  background-color: lightpink;
  border: 2px solid black;
}
.special-child-container2 {
  width: 70%;
  height: 100%;
  background-color: palevioletred;
}