If we need a 3/4 column?

[equinusocio]

I want the first my-grid__item to be 3/4 of the parent width, how i can handle this situation?

<div class="my-grid">
   <div class="my-grid__item"></div>
   <div class="my-grid__item"></div>
</div>

[timhecker]

This mixin works only with equal cols at the moment. Sorry ;)

[equinusocio]

Le griglie sono morte :D