#parent {
  position: relative;
  width: 80%;
  box-sizing: border-box;
  height: 98vh;
  border: 3px solid black;
  display: flex;
  flex-direction: row;
}

.child {
  display: flex;
  position: absolute;
  top: 50px;
  left: 50px;
  width: 100px;
  height: 100px;
  border: 3px solid blue;
}

.main {
  width: 100%;
  display: flex;
  flex-direction: row;
}

.btns {
  width: 20%;
}