Using 9999 Flex Grow Trick

from: http://joren.co/flex-grow-9999-hack/

by Konstantin Rouda

HTML

<div class="flex-container">
  <div class="flex-item red">To be or not to be</div>
  <div class="flex-item blue">
  That is the question!
  </div>
</div>

CSS

.flex-container {
  display: flex;
  flex-wrap: wrap;
  border: 3px solid #0bf;
  border-radius: .2em;
  max-width: 500px;
  margin: 5em auto 0;
  color: #fff;
}

.red {
  background: #e28686;
  flex-grow: 99; /*or we can use 9999*/
  flex-basis: 20em;
}

.blue {
  background: #5e84e4;
  flex-grow: 1;
}







HTML {
  font-size: 16px;
  line-height: 1.5;
  box-sizing: border-box;
}

*,*:before, *:after {
  box-sizing: border-box;
}

JavaScript

// From http://joren.co/flex-grow-9999-hack/