CodePen Embed - RwgopOL

<div class="container">
  <div class="item">1</div>
  <div class="item">2</div>
  <div class="item">3</div>
</div>

.container {
  border: 4px solid;
  display: flex;
}

.container .item {
/*   width: 100px; */
  height: 100px;
  background-color: orange;
  font-size: 40px;
  border: 2px solid;
  flex-grow: 1;
}

.container .item:nth-child(2) {
  flex-grow: 2;
}

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