Microsoft Edge 15 down support an older spec of CSS grid which can cause some layout issues, this mixin utilizes a compound @supports query to weed out this issue.

Grid Support Mixin.scss

// Microsoft Edge 15 down support an older spec of CSS grid
// which can cause some layout issues, this mixin utilizes
// a compound @supports query to weed out this issue.
@mixin grid-support {
  @supports (display: grid) and (not (display: -ms-grid)) {
    @content;
  }
}