<div class="parent">
  <div class="box red"></div>
  <div class="box yellow"></div>
  <div class="box green"></div>
</div>

.parent {
  display: inline-flex;
  gap: 1rem;
  border: 4px solid magenta;
  padding: 8px 1rem;
}

.box {
  width: 100px;
  height: 100px;
  border: 4px solid black;
}

.red {
  background: red;
}

.yellow {
  background: yellow;
  position: relative;
  top: 20px;
  right: 10px;
}

.green {
  background: green;
}