Simple variables and mixins by Itujono Sempardak.

var.scss

$greyCont: #f3f3f3;
$mRight: 10px;
$flexBasis: 18%;
$boxShadow: 0 12px 15px 0 rgba(0, 0, 0, 0.09), 0 17px 50px 0 rgba(0, 0, 0, 0.1);
$autoCenter: 0 auto;
$transEase: all .3s ease;

@mixin flexCenter {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}

@mixin whContent {
  height: 400px;
  margin-bottom: 2em;
  width: 450px;
}