src/utilities/_flex.scss
// =====================================================
// Flex Utilities
// =====================================================
$flex-prefix: "u-flex" !default;
.#{$flex-prefix}-column {
display: flex;
flex-direction: column;
justify-content: center;
}
.#{$flex-prefix}-1 {
flex: 1 1 auto;
}
.#{$flex-prefix}-0 {
flex: 0 0 auto;
}