@mixin arrow($color) {
  border: 1px solid $color;
  border-right: 0;
  border-top: 0;
  content: " ";
  display: block;
  height: 7px;
  pointer-events: none;
  position: absolute;
  transform: rotate(-45deg);
  width: 7px;
}

@mixin center($size) {
  left: 50%;
  margin-left: -($size / 2);
  margin-top: -($size / 2);
  position: absolute;
  top: 50%;
}

@mixin fa($size, $dimensions) {
  display: inline-block;
  font-size: $size;
  height: $dimensions;
  line-height: $dimensions;
  text-align: center;
  vertical-align: top;
  width: $dimensions;
}

@mixin overlay($offset: 0) {
  bottom: $offset;
  left: $offset;
  position: absolute;
  right: $offset;
  top: $offset;
}

@mixin placeholder {
  $placeholders: ":-moz" ":-webkit-input" "-moz" "-ms-input";

  @each $placeholder in $placeholders {
    &:#{$placeholder}-placeholder {
      @content;
    }
  }
}

@mixin replace($background, $width, $height) {
  background-color: $background;
  background-position: center center;
  background-repeat: no-repeat;
  background-size: $width $height;
  display: block;
  height: $height;
  outline: none;
  overflow: hidden;
  text-indent: -290486px;
  width: $width;
}