@mixin display-flex {
   @each $prefix in -webkit-, '' {
     display: #{$prefix}flex;
   }
 }
 @mixin flex-direction($spec...) {
   @each $prefix in -webkit-, '' {
     #{$prefix}flex-direction: $spec;
   }
 }
 @mixin justify-content($spec...) {
   @each $prefix in -webkit-, '' {
     #{$prefix}justify-content: $spec;
   }
 }
 @mixin flex($spec...) {
   @each $prefix in -webkit-, '' {
     #{$prefix}flex: $spec;
   }
 }
 @mixin flex-flow($spec...) {
   @each $prefix in -webkit-, '' {
     #{$prefix}flex-flow: $spec;
   }
 }
 @mixin align-items($spec...) {
   @each $prefix in -webkit-, '' {
     #{$prefix}align-items: $spec;
   }
 }