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HTML

              
                <section class="parent">
  <div class="child hero">
    <h1>Flexbox Playground</h1>
  </div>
</section>

<section class="parent">
  <div class="child small">Width: 20%</div>
  <div class="child">Free Float</div>
</section>

<section class="parent">
  <div class="child big">Width: 50%</div>
  <div class="child">Lorem ipsum dolor sit amet, consectetur adipisicing elit. At accusantium minus quae doloremque, vero iure, error voluptatem repellendus nobis a molestias fugit optio neque enim quas perferendis et voluptas consectetur?</div>
  <div class="child">Free Float</div>
</section>

<section class="parent">
  <div class="child">Hello</div>
  <div class="child small">Width: 20%</div>
  <div class="child medium">Width: 40%<br>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque quo rerum dolor eaque iusto laboriosam, asperiores provident tempore non, ipsa alias consequuntur. Quasi voluptates recusandae ab a tenetur velit inventore.</div>
  <div class="child">Flexbox</div>
</section>

<section class="parent">
  <div class="child">Hello</div>
  <div class="child small">Width: 20%</div>
  <div class="child big">Width: 50%</div>
  <div class="child" style="width:30%">Flexbox</div>
</section>
              
            
!

CSS

              
                @import "compass/css3";

body {
  padding: 30px;
  background: #efefef;
}
.parent {
  display: flex;
  /* flex-wrap: wrap; */
}
.child.hero {
  background: #31B7FF;
  color: #fff;
}
.child {
  @include box-shadow(#ccc 0 1px 3px);
  flex: 1;
  background: #fff;
  margin: 5px;
  padding: 13px;
  overflow: hidden;
}
.big {
  width: 50%;
  flex: none;
}
.medium {
  width: 40%;
  flex: none;
}
.small {
  width: 20%;
  flex: none;
}
              
            
!

JS

              
                
              
            
!
999px

Console