Flexbox - aligning multiple lines.

SassMeister-input-HTML.haml

%header
  %h1 Flexbox - aligning multiple lines
%article
  %section.flex-container
    .box
      %h3 One
    .box
      %h3 Two
    .box
      %h3 Three
    .box
      %h3 Four
    .box
      %h3 Five
    .box
      %h3 Six
    .box
      %h3 Seven
    .box
      %h3 Eight
    .box
      %h3 Nine

SassMeister-input.scss

// ----
// Sass (v3.3.0.rc.2)
// Compass (v1.0.0.alpha.17)
// ----

@import "compass";
@import url(http://fonts.googleapis.com/css?family=Audiowide);

// Documentation about Flex
// http://www.w3.org/TR/css3-flexbox/

$colors: (chartreuse, royalblue, plum, teal, lightsteelblue, sienna, maroon, lime, cornflowerblue, darkviolet, dodgerblue);

@for $n from 1 through length($colors) {
  .box:nth-child(#{$n}) {
    background-color: nth($colors, $n);
  }
}

body {
  width: 80%;
  margin: 0 auto;
  padding: 2%;
  line-height: 1.6;
}

.flex-container {
  @include display-flex(flex);

  border: 1px solid #333;
  margin: 0 auto;
  width: 50%;
  height: 600px;
  
  // flex-start, flex-end, space-between, space-around
  @include justify-content(space-around);
  // flex-flow is a shorthand for flex-direction & flex-wrap
  @include flex-flow(row wrap);
  // flex-start, flex-end, center, space-between, space-around, stretch
  @include align-content(flex-end);
}

.box {
  font-family: 'Audiowide', cursive;
  font-size: 1.8em;
  line-height: 1;
  margin: 0 5px;
  padding: 10px 20px;
  text-align: center;
}

SassMeister-output.css

@import url(http://fonts.googleapis.com/css?family=Audiowide);
.box:nth-child(1) {
  background-color: chartreuse;
}

.box:nth-child(2) {
  background-color: royalblue;
}

.box:nth-child(3) {
  background-color: plum;
}

.box:nth-child(4) {
  background-color: teal;
}

.box:nth-child(5) {
  background-color: lightsteelblue;
}

.box:nth-child(6) {
  background-color: sienna;
}

.box:nth-child(7) {
  background-color: maroon;
}

.box:nth-child(8) {
  background-color: lime;
}

.box:nth-child(9) {
  background-color: cornflowerblue;
}

.box:nth-child(10) {
  background-color: darkviolet;
}

.box:nth-child(11) {
  background-color: dodgerblue;
}

body {
  width: 80%;
  margin: 0 auto;
  padding: 2%;
  line-height: 1.6;
}

.flex-container {
  display: -webkit-flex;
  display: flex;
  border: 1px solid #333;
  margin: 0 auto;
  width: 50%;
  height: 600px;
  -webkit-justify-content: space-around;
  justify-content: space-around;
  -webkit-flex-flow: row wrap;
  flex-flow: row wrap;
  -webkit-align-content: flex-end;
  align-content: flex-end;
}

.box {
  font-family: 'Audiowide', cursive;
  font-size: 1.8em;
  line-height: 1;
  margin: 0 5px;
  padding: 10px 20px;
  text-align: center;
}

SassMeister-rendered.html

<header>
  <h1>Flexbox - aligning multiple lines</h1>
</header>
<article>
  <section class='flex-container'>
    <div class='box'>
      <h3>One</h3>
    </div>
    <div class='box'>
      <h3>Two</h3>
    </div>
    <div class='box'>
      <h3>Three</h3>
    </div>
    <div class='box'>
      <h3>Four</h3>
    </div>
    <div class='box'>
      <h3>Five</h3>
    </div>
    <div class='box'>
      <h3>Six</h3>
    </div>
    <div class='box'>
      <h3>Seven</h3>
    </div>
    <div class='box'>
      <h3>Eight</h3>
    </div>
    <div class='box'>
      <h3>Nine</h3>
    </div>
  </section>
</article>