@mixin flex( $dir:row, $just:space-between, $align:center, $wrap:nowrap ) {
  display: flex;
  flex-direction: $dir;
  justify-content: $just;
  align-items: $align;
  flex-wrap: $wrap;
}

@mixin rem-size($remValue: 1 ) {
  font-size: ($remValue * $font-size-px-default); //fallback for old browsers
  font-size: $remValue + rem;
}

@mixin shadow($vert: 6px, $blur: 12px, $opacity: 0.075) {
  -webkit-box-shadow: 0 $vert $blur 0 rgba(0, 0, 0, $opacity);
  -moz-box-shadow: 0 $vert $blur 0 rgba(0, 0, 0, $opacity);
  box-shadow: 0 $vert $blur 0 rgba(0, 0, 0, $opacity);
}

@mixin trans($args...) {
  -webkit-transition: $args;
  -moz-transition: $args;
  -ms-transition: $args;
  -o-transition: $args;
  transition: $args;
}

.background-cover {
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center center;
}