<div class='first-container'></div>
<div class='second-container'></div>

.first-container {
  position: absolute;
    background-color: red;
    width: 50px;
    height: 40px;
  margin: 20px;

}
.second-container {
    background-color: green;
    width: 100px;
    height: 100px;



}