<div class="hooks-main">
  <div></div>
  <div></div>
</div>

.hooks-main > div {
  background: orangered;
  opacity: 0.6;
  position: absolute;
  top: 80px;
  left: 120px;
  width: 300px;
  height: 120px;
}

.hooks-main > div:nth-child(2) {
  width: 100px;
  height: 300px;
}

.hooks-main {
  position: absolute;
  width: 100%;
  height: 100%;
  overflow: hidden;
}