title: Customizing Bootstrap 4 css
body: <p>I am following this link:
  <a href="http://v4-alpha.getbootstrap.com/getting-started/options/" rel="noreferrer">Docs</a></p>
  
  <p>Specifically:
  <strong>Customize Bootstrap 4 with our built-in custom variables file and easily toggle global CSS preferences with new $enable-* Sass variables. Override a variable’s value and recompile with the included Gruntfile as needed.</strong></p>
  
  <p>I have never used Gruntfile before. Can I use other tools to compile scss into css? Also, what the outcome of such compilation is going to be? A _custom.css that must be placed in the same folder where original bootstrap.css is?</p>
  
  <p>Thanks for help.</p>