title: How to use flexbox with Bootstrap alpha v6
body: <p>With bootstrap alpha v4 there was the option to enable the use of flexbox within the file _variables.scss. </p>
  
  <p>All we had to do was set <code>enable-flex:  false !default;</code> . to <code>enable-flex:  true !default;</code></p>
  
  <p>However I can't find the option to enable flexbox anywhere within the file _variables.scss after downloading the source files of Bootstrap alpha v6.</p>
  
  <p>Any idea where we can enable flexbox and possible give me a simple example of how to use/implement it? 
  Thanks</p>