Import grid.sass to project.
In _grid-parameters.sass all static sizes for each breakpoint.
In _variables.sass add css variables responsive values if necessary.

In the project must be initialized breakpoints mixins:
+xl, +lg, +md, +sm, +xs, +xxs, +xlmin, +lgmin, +mdmin, +smmin, +xsmin, +xxsmin
such as

=xl
  @media (max-width: 1399 + "px")
    @content
=xlmin
  @media (min-width: 1400 + "px")
    @content

Grid columns must have .grid wrapper and class .col
Columns mods: .col--xl-1, .col--lg-1, .col--md-1, .col--sm-1, .col--xs-1, .col--xxs-1, .col--1

<div class="grid {grid--mod}">
  <div class="col {col--mod}"></div>
  <div class="col {col--mod}"></div>
</div>