flex grow

by zhang li

HTML

<div class="main">
  <div class="left"></div>
  <div class="right"></div>
</div>

CSS

.main {
  display: flex;
  height: 100px;
  background: #ddd;
}

.left {
  background: red;
  flex-grow: 1;
}

.right {
  background: green;
}