HOW TO EXTEND SASS FRAMEWORKS PROPERLY
Really why has no one discussed this.

In order to extend a SASS framework, like bulma, properly is to first use the
provided customization features. This means defining some variables:

....
$myvar: blue;
....

But you also want *this* to be customizable also! To do this we use the
`!default` keyword defined in SASS:

....
$myvar: blue !default;
....

Great, now what?

OVERRIDING STYLES, MIXINS, AND WHATEVER ELSE

There are two ways to go about this:

. Split your variables and styling into two files, and include bulma in the
middle of everything.
. Include parts of bulma in the middle of your files.

I believe the latter is the best way to do this since it keeps a high level of
locality but remains flexible.

....
@import 'myvar-file';
@import 'bulma/components/dropdown';

.mystyle {
  @include mixin-from-file;
}
....

And that's it!